Do You Need a Vent Hood Over an Outdoor Grill? Covered Patios, Pergolas and Code

Every week someone walks into our Maspeth showroom with a photo of a covered patio and asks the same thing: "Do I really need a hood out there? It's outside." The honest answer depends entirely on what is above the grill. Under open sky, no. Under a roof, a soffit, a screened porch or a pergola with a solid top, the grill manufacturer usually decides for you, and the answer is almost always yes. We sell and install outdoor vent hoods from Blaze, XO, Hestan, Summerset and Twin Eagles across NYC, Long Island, Westchester, New Jersey and South Florida, and most of those jobs started with exactly this question.

This guide walks through what the installation manuals actually say, how to size a hood by CFM, width and mounting height, what the ducting and electrical look like, and what a building inspector may ask to see. If you are still planning the island itself, our outdoor kitchen collection and the built-in grill lineup are the place to start.

At a glance: which setups need a hood

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What do the grill manuals actually require?

This is the part most people skip, and it is the part an inspector or an insurance adjuster will read. We pulled the current installation manuals for the grills we sell most.

Blaze. The Premium LTE+ manual is blunt: "This outdoor cooking gas appliance must not be installed under overhead combustible construction." When the overhead is non-combustible, "the area above the Blaze appliance must be covered with a UL-approved vent hood," the bottom of the exhaust fan "should be placed 36 inches above the cooking surface," and the hood must be "larger than the cooking area" with "a minimum of 1000 CFM." The clearance drawing lists 72 inches to non-combustible overhead construction with a vent hood, and 18 inches to side and rear combustibles. That applies to the Blaze Premium LTE+ 32 inch at 66,000 total BTU and the 40 inch at 80,000 BTU.

Lynx. The Professional grill guide says never to locate the grill "under a roof or overhang, in a building, garage, shed or other such enclosed area," and not to use it "under any unprotected overhead combustible construction." It then gives the path to compliance: "If installed under any combustible construction the cooking area over the grill must be covered with an exhaust hood," the hood "must provide 3 to 6 inches of overhang on all exposed sides," and it "shall provide no less than 1,200 CFM." A Lynx L36TR under a covered patio is a 1,200 CFM hood job, full stop.

Hestan. Hestan approaches it from the hood side. Its outdoor hood manual is "for non-combustible locations only," requires the hood to be "covered by a protective roof to prevent water intrusion," wants 24 inches to vertical combustibles on either side, and states that "the vent hood must be turned on at all times when the grill is on." It also makes a point many homeowners miss: stucco or tile over wood framing still counts as combustible.

Twin Eagles. The hood manual approves the canopy "in an outside patio or lanai area if the area is covered with a protective roof over the hood," on a GFCI protected circuit, with the roof extending at least 42 inches past each side of the hood and 30 inches past its front edge. Lynx's hood instructions use the same 42 and 30 inch figures.

How many CFM does an outdoor grill hood need?

Outdoor hoods move far more air than indoor range hoods because they fight cross drafts and a much bigger burner load. You will see a rule of thumb online that says to divide the grill's total BTU by 100 to get CFM. By that math a 66,000 BTU Blaze LTE+ 32 would need 660 CFM. We could not find that rule in any manufacturer manual, and every manufacturer we checked sets a floor well above it, so treat the BTU math as a sanity check and the manual as the rule.

Two practical notes. First, Hestan publishes an "equivalent CFM" (1,350 and 1,800) alongside its rated figures because its blower design is measured differently, so compare rated to rated. Second, more CFM is not free. A 2,000 CFM dual blower pulls roughly twice the air of a 1,000 CFM single, which means more make-up air, more noise and a bigger duct. Match the hood to the grill plus whatever side burner or power burner sits under the same canopy, then stop.

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How wide should the hood be, and how high do you mount it?

Width. Wind pushes smoke sideways before the hood can grab it, so outdoor hoods want overhang. XO's manual says to oversize "by 3 inches on each side," with the worked example that a 36 inch grill takes a 42 inch hood. Twin Eagles and Lynx want "at least 3 inches, and preferably 6 inches" past either side of the cooking area. Summerset ties it to height: mounted higher than 32 inches, the hood "should be at least 6 inches wider than the cooking appliance." Our rule in the showroom: a 32 to 36 inch grill gets a 42 inch hood, a 40 to 42 inch grill gets a 48 inch hood, and a grill plus a double side burner under one canopy gets a 54 or 60 inch hood.

Height. Measure from the cooking grates to the bottom edge of the hood.

• Blaze: 36 inches minimum, 36 to 40 inches recommended.
• Twin Eagles and Lynx: 36 inches minimum, centered over the appliance.
• Summerset: 32 to 36 inches.
• XO: 30 to 36 inches, with 60 inches minimum from the cooking surface to non-combustible overhead.
• Hestan: 30 inches "for optimum performance," subject to the grill's own clearances.

Too low and the hood takes heat damage and becomes a fire hazard (Summerset's words). Too high and it loses capture and you cannot reach the controls. Blaze's 36 inch deep canopy exists specifically so the hood can sit higher without losing smoke off the front edge; the Summerset and Twin Eagles canopies are 30 inches deep, XO's is 33, Hestan's is 34.6.

Ceiling height math. Counter at 36 inches, grates roughly 2 inches above that, 36 inches of clearance, an 18 inch tall hood, and you are at 92 inches before any duct cover. On an 8 foot patio ceiling that leaves 4 inches, which is why Blaze sells low ceiling and high ceiling extendable duct covers and why we measure the ceiling before quoting the hood.

Ducting, termination and make-up air

An outdoor hood is a ducted appliance. Every manufacturer we sell forbids recirculating or dumping into an attic, soffit cavity or chimney. The duct runs up through the roof or back through the wall to a cap with a gravity damper, and the cap has to be sealed against water because the structure above a covered patio is usually your house.

• Duct size. Summerset: 8 inch round, one duct on the 36 inch hood, two on the larger sizes. Blaze 36: two 8 inch outlets, and Blaze wants them kept as separate runs rather than combined. XO: 10 inch round. Twin Eagles and Lynx: 10 inch. Hestan: 8 inch per dual blower, combining to 10 or 12 inch through a transition. Never reduce the size.
• Material. Smooth rigid galvanized or aluminum only. No plastic, no flexible corrugated duct (XO allows flex only under 6 feet and penalizes it 50 percent in the length math).
• Run length and elbows. Summerset and Blaze: no more than three 90 degree elbows, with 24 inches of straight pipe between any two. Hestan: a 90 counts as 5 feet of duct, and runs over 20 feet grow by an inch of diameter per 10 feet. XO caps total equivalent length at 100 feet.
• Termination. Roof cap or wall louver with a damper, 8 inch minimum for Summerset, 1,000 CFM rated per cap for Blaze. No screens, no spring loaded doors (Hestan). Caulk the exterior penetration.

Make-up air. On an open patio the hood pulls replacement air from the yard and nobody notices. On a screened or three-walled porch, a 1,200 CFM hood can depressurize the space, pull smoke back off the grill, and in the worst case draw exhaust from a nearby appliance. XO's manual says negative pressure "must not exceed 4 Pa" and calls for adequate ventilation of the room. The fix is simple at the design stage: leave a wall open, or add a louvered opening low on the enclosed side so air can come in as fast as the hood pushes it out.

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Insulated jacket vs vent hood: different problems

These two get confused constantly, usually because both show up on the same "required accessories" list. They solve unrelated problems.

An insulated jacket is a stainless sleeve that wraps the sides, back and bottom of a built-in grill head. It protects the island cabinet, not the ceiling. Lynx puts it plainly: "Installation into a combustible enclosure requires an insulated jacket accessory." If your island is framed in wood, or clad in a composite that is not rated non-combustible, the grill goes in a jacket. The Blaze 32 inch jacket and the Hestan 36 inch jacket are the two we stock most. A metal stud and cement board island does not need one.

A vent hood protects what is above the grill and clears smoke and grease from a covered space. It does nothing for the cabinet below.

So a wood framed island on an open deck needs a jacket and no hood. A cement board island under a covered patio needs a hood and no jacket. A wood framed island under a covered patio needs both. Nobody likes hearing the last one, but it is the common case on Long Island pool houses.

Pergolas, fabric, wood ceilings and fire risk

Pergolas are where the open sky rule breaks down. Three cases:

Louvered aluminum pergola. Louvers open, this is effectively open sky. Louvers closed, it is a solid non-combustible roof, and now the grill manual's "under non-combustible overhead" clause applies: Blaze wants a hood, Lynx wants a hood. In practice our customers with louvered pergolas grill with the louvers open and skip the hood, and they accept that they cannot grill in the rain. If you want to close the roof and cook, budget for the hood and confirm the pergola maker allows a duct penetration.

Wood pergola, open slats. Rafters directly over the grates are overhead combustible construction. A rotisserie flare-up at 500 degrees under dry cedar is a real ignition risk, and a hood alone does not satisfy Blaze's prohibition because the wood is still there around the hood. The honest fix is to shift the grill so no rafter sits over the cooking area, or sheath the zone above the hood in cement board or metal.

Fabric canopy, retractable awning, shade sail. Do not put a gas grill under any of these. Grease laden air condenses on the fabric and it is a wick. We decline these installs.

One more risk nobody mentions: grease in the duct. Outdoor hoods run baffle filters (Blaze, XO, Summerset, Twin Eagles) or a baffle-less centrifugal design (Hestan's CircuFlow) to pull grease out before it reaches the pipe. Pull the baffles and run them through the dishwasher every few weeks in season. A duct full of grease over a wood ceiling is the one failure mode a hood can create rather than prevent.

Lighting, noise and electrical

Lighting. Every hood we carry lights the grates, which matters more than you would think when you are reading a thermometer at 9 pm in October. XO uses four 3000K LEDs. Summerset uses four dimmable LEDs. Blaze uses two halogens with four brightness settings on the 36 inch, and selectable color temperature on the newer VHOOD2 series. Twin Eagles uses dual halogens with two settings. Hestan uses low temperature LEDs.

Noise. Published figures are not measured the same way, so compare loosely. Summerset lists 58 dB for its single motor 36 inch and 62 dB for the dual motor sizes. XO lists 2 sones on low up to 10 sones on high. Hestan lists 6.3 to 6.6 sones. Blaze's store listing shows 2 sones, which we would read as the low speed. None of these are quiet on high; the point of four speeds is that you run high while searing and drop to low for the rest of the cook.

Electrical. All of these are 120V, 60 Hz appliances. Twin Eagles and Summerset call for a dedicated 15 amp circuit; XO draws 8.5 amps; Hestan draws 6.0 amps on the 42 inch and 7.5 on the 48 and 54. Every one of them is listed for damp locations only on a GFCI protected branch circuit. That means a licensed electrician, a weather rated junction box behind the hood, and a disconnect means. Do not plan on an extension cord from the garage.

What NYC and Long Island inspectors may ask

A vent hood by itself is an electrical appliance, so the permit conversation is usually about the grill, the gas line and the structure, with the hood pulled in as part of the manufacturer's installation requirements.

• Gas. In New York City a natural gas grill must be installed by a licensed master plumber under the NYC Fuel Gas Code, with the piping inspected and tested. The DOB's own barbecue guidance says so directly. On Long Island the town building department issues the plumbing permit; Nassau and Suffolk towns vary on whether they want a sealed drawing for a covered outdoor kitchen.
• Propane in NYC. Multiple dwellings may not store a standard 20 pound propane grill on a balcony, roof deck, roof, rear yard or courtyard. One and two family homes are limited to two 20 pound tanks under Fire Code 307.5.3. If you live in a co-op or condo, a covered patio grill is a natural gas job or an electric grill, and the board will want to see the hood in the plans.
• Clearances. Expect to be asked for the grill's installation manual page showing overhead and side clearances, and the hood's listing label. Inspectors who have never seen an outdoor hood tend to default to indoor commercial kitchen rules; having the UL listing and the manufacturer's covered patio language printed out shortens that conversation.
• Structure. A roof penetration on a covered patio attached to the house is a roofing detail the building department can ask about. A duct through a fire rated wall between attached houses in Queens or Brooklyn is a bigger question; we route around those.
• Electrical. The GFCI circuit for the hood is on the electrical permit with the grill lights and rotisserie outlet.

In Florida the conversation is shorter but the hood matters more: a Jupiter or Stuart lanai with a screen enclosure and a solid roof is exactly the three-walled case where capture and make-up air decide whether the family room fills with smoke.

Our recommended models

These are the hoods we sell and install most, picked for the covered patio case specifically: capture depth, CFM against the manufacturer minimums, duct flexibility and how they hold up in salt air. Every one is listed for outdoor use on a GFCI circuit.

Best OverallXO36 Inch Outdoor Hood, 1,200 CFMTwin independently controlled blowers, 33 inch deep canopy, four LEDs and a 2 sone low speed make this the easiest hood to live with over a 30 to 32 inch grill.View details →Best ValueBlaze36 Inch Vent Hood, 1,000 CFMThe deepest canopy in the group at 36 inches, which lets it sit higher over a Blaze Prelude or Premium LTE+ 32 and still meet Blaze's own 1,000 CFM requirement.View details →Best PremiumHestan48 Inch Wall Mount Hood, 1,200 CFMBaffle-less CircuFlow blower that speeds up on its own when it senses heat, dishwasher safe blower parts, and twelve color finishes to match a Hestan 36 inch grill.View details →Best for Wide GrillsSummersetVH48-3 48 Inch Hood, 2,000 CFMDual centrifugal blowers, double lined 304 stainless and a lifetime stainless warranty for a 40 or 42 inch grill with a power burner beside it.View details →Best American MadeTwin Eagles36 Inch Vent Hood, 1,200 CFMFully welded 304 stainless designed and built in the USA, 10 inch duct, lifetime warranty on the stainless, and the right look over a Twin Eagles 36 inch grill.View details →Best Island Vent PanelBlaze6 x 14 Inch Island Vent PanelNot a hood: this vents the island cabinet so gas cannot pool inside it. Blaze says to install one every four to six feet of island, and every gas island needs them whether or not there is a roof.View details →

Need a 42 inch size? The XO 42 inch is the right answer over a 36 inch grill by XO's own 3 inch per side rule, and the Hestan 42 inch at 900 CFM is sized for a 30 inch Hestan grill. For a 54 inch grill or a grill plus double side burner, look at the Hestan 54 inch or the Summerset VH42-3 and larger.

Which should you choose?

Our recommendation for the typical covered patio with a 32 to 36 inch gas grill: a 42 inch, 1,200 CFM hood such as the XO 42 or the Hestan 48, mounted 36 inches above the grates, rear or roof vented in 10 inch rigid duct on its own GFCI circuit, with the ceiling around the duct cover finished in cement board or metal. That meets every manual we quoted, keeps the fan on speed two most of the time, and costs far less than replacing a stained, grease soaked soffit in three years. If the grill is under a wood pergola, fix the pergola first; the hood is not a substitute.

Frequently asked questions

Do you need a vent hood for an outdoor grill under a covered patio?

Yes in almost every case. Blaze requires a UL approved vent hood of at least 1,000 CFM over its gas grills under non-combustible overhead construction, and Lynx requires an exhaust hood of no less than 1,200 CFM under any combustible construction. Under open sky, no hood is needed.

Can you put a gas grill under a pergola?

Under an open louvered aluminum pergola, yes. Under wood rafters directly over the grates, Blaze and Lynx both prohibit installation beneath unprotected overhead combustible construction, so you need to move the grill, protect the ceiling zone, or both, and then add a hood. Never grill under a fabric canopy or awning.

How many CFM should an outdoor grill hood have?

Plan on 1,000 to 1,200 CFM for a single 30 to 36 inch grill, which is the floor set by Blaze and Lynx. Hestan pairs 900 CFM with a 30 inch grill and 1,200 CFM with 36 and 42 inch grills. Step up to a 2,000 CFM dual blower for 40 inch and wider grills or when a power burner sits under the same canopy.

How high should a vent hood be above an outdoor grill?

Most manufacturers specify 30 to 36 inches from the cooking grates to the bottom of the hood. Blaze and Twin Eagles want 36 inches minimum, Blaze recommends 36 to 40, Summerset says 32 to 36, and XO says 30 to 36. Mounting too low creates a heat and fire hazard; too high loses capture.

How wide should the hood be compared to the grill?

Wider than the grill. XO recommends 3 inches extra per side, so a 36 inch grill takes a 42 inch hood. Twin Eagles and Lynx want 3 to 6 inches of overhang on each side. Summerset wants the hood 6 inches wider when it is mounted more than 32 inches above the grates.

Can an outdoor vent hood be ductless or recirculating?

No. Every outdoor hood we sell must be ducted to the outdoors through a roof cap or wall louver with a damper. Manufacturers prohibit terminating into an attic, soffit or chimney, and they require rigid metal duct rather than plastic or flexible corrugated pipe.

Is an insulated jacket the same as a vent hood?

No. An insulated jacket wraps the grill head to protect a combustible island cabinet around it. A vent hood protects the ceiling above the grill and removes smoke and grease. A wood framed island under a covered patio needs both.

Do I need a permit for an outdoor vent hood in NYC?

The hood itself is wired on the electrical permit for the outdoor kitchen on a GFCI protected circuit. The bigger permit items are the gas line, which in New York City must be installed by a licensed master plumber under the NYC Fuel Gas Code, and any roof or wall penetration for the duct. Co-op and condo boards generally want the hood shown in the plans.

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Written by the NYC Fireplaces & Outdoor Kitchens team. Last reviewed October 2026. We sell, install and service the products discussed here.

Sources:Blaze Outdoor Vent Hoods and BLZ-36-VHOOD manual, Blaze Premium LTE+ (BLZ-4LTE3/5LTE3) installation manual, XO XOGV outdoor hood page and install manual, Hestan outdoor canopy hood spec sheet 018104 Rev B and installation manual, Summerset 2025 vent hood owner's manual, Twin Eagles vent hood owner's manual, Lynx grill install guide and LOH vent hood instructions, NYC Department of Buildings barbecue guidance (Fuel Gas Code 623, Fire Code 307.5). Specifications change; always confirm with the manufacturer's current installation manual.