Every bath fan, range hood, dryer, and ERV ends its run at the same place: the termination cap. It is the smallest part of the system and often the one chosen last, yet it decides whether exhaust air leaves the building cleanly or lingers where it causes damage. A cheap plastic flapper can rattle in the wind, stick open in winter, let pests into the duct, or add enough resistance to cut a fan’s real airflow.
Worse is no cap at all. Ventilation Maximum puts it plainly: exhaust ducts are often discharged into attic roof vents, down into the soffits, or straight into the attic space. A 110 CFM bath fan doing that dumps 110 cubic feet of moist air into the attic every minute it runs, which leads to mold, rot, wet insulation, ice dams, and shingle damage. The soffits are the attic’s fresh air intake, so exhaust sent there simply comes back in.
Three manufacturers solve this with heavy gauge metal caps built to last: Artis Metals, Ventilation Maximum, and Seiho.
Wall Caps
When the duct runs out through a sidewall, the wall cap is the only thing between the duct and the weather. It needs to seal tight when the fan is off, open freely when it runs, and keep out birds and rodents.
Artis Metals Wall Hoods
Artis wall caps are made for dryer venting, kitchen and bath fan exhaust, furnace air intake, whole house ventilation, and HRVs. Damper models come standard with a spring close damper and weather seal for better energy performance.
- Configurations: Order with a damper only, a screen only, or a damper and screen (D, S, or SD prefix). Use damper only for dryer venting, and screen only for furnace air intake.
- Dampers and Screens: Spring close, foam lined dampers. Screens are 1/4 inch, with 1/8 inch screens available on request.
- Three Materials:
- Galvanized Steel: G-90 galvanized steel, sizes 4 to 12 inch.
- Stainless Steel: 304-2B Stainless hood, flange, and collar with an aluminum damper. Sizes 4 to 12 inch.
- Copper: 16 oz. copper with copper screens, a natural match for copper roofing and trim. Sizes 4 to 10 inch.
Product Pages: Galvanized Steel | Stainless Steel | Copper
Specs: Galvanized Steel | Stainless Steel | Copper
VMAX AF Series Wall Exhaust Traps
The AF series is built for dryers, bath fans, air exchangers, and range hoods, and its patented back-draft damper is the centerpiece. The housing is designed for accurate net airflow in both directions, which eliminates discharge pressure at the outlet.
- Patented Triple Seal Damper: An air tight, triple sealed, insulated shutter closes thermetically between the home and the outdoors for real energy savings. Because the damper is insulated, air inside it stays warm, so it resists condensation and never freezes shut.
- Anti-Gust Deflector: A storm proof deflector stops wind gusts from opening and closing the damper, so there is no clapping noise.
- Exhaust or Intake: The damper converts from exhaust to air intake in minutes, making the same hood useful for makeup or fresh air.
- Construction: Factory built galvanized steel housing with a removable galvanized steel bird screen. Phosphate treated and finished inside and out with baked polyester powder paint with UV protection, in black or white standard, with special and RAL colors available.
- Sizes: 3, 4, 5, and 6 inch round, plus 3-1/4 x 10 inch rectangular (AF3 through AF10).
- Warranty and Standards: Lifetime warranty on manufacturing defects and 5 years on paint and corrosion. ASTM-527.
VMAX AF Product Page | VMAX AF Specs
Seiho SFX and SFX-S Hooded Vent Caps
Where the exhaust exits a visible wall, Seiho’s hooded vent caps bring an architectural look to the termination. The SFX shares the round louvered face of Seiho’s SX cap and adds a full hood making it the right pick for exteriors that need protection from the elements the building design does not already provide. They suit bathroom and kitchen exhaust, fresh air intake, storage rooms, attics, and basements in homes, apartments, and commercial buildings.
- Two Materials:
- SFX (Aluminum): Lightweight aluminum with a clear anodized finish, in 3-12 inch duct sizes.
- SFX-S (Stainless Steel): 304 stainless steel with a polished finish, 4 and 6 inch duct sizes.
- Free Area: 0.02 sq ft (3 inch) – 0.31 sq ft (12 inch).
- Simple Installation: A spring mounted collar slides into the duct and holds the cap in place, so the face is installed with only high grade silicone caulk. No screws mar the surface, and no special tools or adjustments are required, so the caps can go in after all other exterior work is complete.
- Built-In Drain: A drain at the bottom of the cap lets water escape.
- Options: Insect screens are available (SFX-N and SFX-SN models), and custom colors are available for the SFX Series.
- Sizing Tip: Seiho recommends a maximum free area velocity of 750 FPM. Divde the fan’s CFM by 750 to find the minimum free area, so a 125 CFM fan needs at least 0.16 sq. ft., which points the the 10 inch SFX at 0.24 sq. ft.
Important Note: Seiho’s free area is given in sq. ft. instead of sq. in. To determine the minimum free area for sq. in., multiply the minimum sq. ft. by 144. (0.16 sq. ft. would be 23 sq. in.)
Product Pages: SFX | SFX-S
Specs: Seiho Wall Caps Catalog
Roof Caps
A roof cap has a harder job than a wall cap. It sits in direct sun, rain, and snow, and it has to keep water out of a hole in the roof for decades while letting exhaust out freely.
Artis Metals J-Vent Roof Caps
The Artis J-Vent is used mainly as an exhaust vent for bathrooms, range hoods, and other air quality applications, and it also works for passive attic ventilation or fresh air intake.
- Low Silhouette: A low profile hood that sits cleanly on the roofline and installs on any roof pitch.
- Insect Screen: A 1/8 inch insect screen comes standard.
- Installation: Every J-Vent roof cap we carry is the hard connect version, with an extended collar that reaches below the roof sheathing. Rigid or flex duct connects directly to that collar, creating a secure, sealed path from the fan to the outdoors.
- Three Materials:
- Galvanized Steel: G-90 galvanized steel, 4 to 12 inch, with free area from 12-113 sq. in.
- Stainless Steel: 4 inch round duct with a crimped hood, and a 6 or 8 inch round duct with a three piece hood.
- Copper: 4 inch round duct with a crimped hood, and 5 through 12 inch round duct with a three piece hood.
Product Pages: Galvanized Steel | Stainless Steel | Copper
Specs: Galvanized Steel | Stainless Steel | Copper
Ventilation Maximum VMAX CT Roof Exhaust Traps
Ventilation Maximum designed the CT series specifically to carry both fan, range hood, air exchanger, and dryer exhaust up and out of the building, with details that most roof caps skip.
- Raised Discharge: The exhaust sits 5-3/4 inches off the roof deck so the wind carries the exhaust away instead of depositing it on the roof, where odors can soak in and attract rodents. The height also reduces the risk of water infiltration.
- Built-In Deflector: The deflector prevents back drafts and damper clapping, sends exhaust out the sides instead of straight down so warm air does not melt snow and form ice dams, and lets the cap keep working even when buried under snow.
- Damper With Moisture Relief: A built-in damper opens when the fan runs and closes when it shuts off. A small opening in the damper releases excess moisture between the fan and the cap, so condensation cannot freeze the damper open or closed.
- Full Size Collar: A built-in collar matches the fan outlet so exhaust flows up and out without restriction, reducing condensation inside the unit.
- Models:
- VMAX-CT-4: Built-in 4 inch round collar.
- VMAX-CT-6: Built-in 6 inch round collar.
- VMAX-CT-10: Built-in 3-1/4 x 10 inch rectangular collar for range hoods.
- Construction: 24 and 26 gauge structural galvanized steel (ZF75) with a built-in wire mesh rodent screen and an anti-gust, storm proof deflector. Finished inside and out with baked polyester powder paint with UV protection, in black, brown, or grey. Fits roof slopes from 2/12 to 15/12.
- Warranty: Limited lifetime warranty on all manufacturing defects and 5 years on paint and corrosion.
VMAX CT Product Page | VMAX CT Specs
Finish the Job Right
A well chosen fan deserves a cap that lets it perform. For the wall, Artis offers simple, durable caps in galvanized, aluminum, stainless, or copper, while the Ventilation Maximum AF series adds a patented insulated damper that seals tight and never freezes shut, and the Seiho SFX and SFX-S bring a clean, hooded architectural look in anodized aluminum or polished stainless steel. For the roof, the Artis J-Vent gives a low profile cap in the material that matches the home, and the Ventilation Maximum CT series lifts exhaust off the roof with a deflector that fights back drafts and ice dams. Explore our full selection of wall caps and roof caps at HVACquick.com.
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