Price: $269 - $305
Availability: In Stock - Usually ships in 1 to 2 days.
4" Greenhouse Kit is out of stock until Fall.
Vent Size
Compatible Gas Heaters
3 inch Modine Hot Dawg - HD30, HD45, HD60, & HD75
4 inch Modine Hot Dawg - HD100 & HD125   Mr. Heater / Big Maxx - MHU50, MHU80, MHU125   Reznor - UDX & UDZ (up to 125K BTU)   Dayton - Low profile unit heaters up to 120K BTU

These universal heater exhaust kits come complete with everything needed to vent a gas heater up to 3' (additional pipe and/or a drip tee may be required for some units). These 3' stainless steel, gas tight, category 3 vent systems are approved for horizontal installation in residential and commercial applications for gas unit heaters. Most durable, longest lasting, and lowest maintenance vent system available for Mr. Heater, Modine Hot Dawg, Dayton, Reznor, and other brands of gas unit heaters.

Garage / Shop Heater Vent Kit Includes
For structures with an exterior wall at least 4" thick. Adjustable length.
(1) heater adapter, (2) 12" vent pipes, and (1) adjustable wall thimble + 18" pipe, (1) termination tee

Greenhouse Heater Vent Kit Includes
For greenhouses and structures with walls less than 4" thick.
(1) heater adapter, (1) 36" vent pipe, (2) firestop flashings, and (1) storm collar, (1) termination tee

Vent pipe and fittings feature patented built-in mechanical locking band and triple-lipped directional gaskets. All pipes and components are engineered with smooth clean welds located 90° from mechanical locking bands. All pipe and fittings are UL1738 approved for category II, III and IV venting applications.

Category 3 Gas Heater Vent Pipe and Fittings
What is UL 1738? In short, it is a US standard for gas venting systems required in category 3 applications. Category 3 refers to positive vent pressure which is created by exhaust blowers in unit heaters. These vent systems must be constructed of AL29-4C® stainless steel, contain gaskets for sealing, and have a built in mechanical locking band among other requirements. All category 3 vent pipe and fittings offered are single wall.

  • Made of AL29-4C® super-ferritic stainless steel
  • Built-in high temp silcone gaskets for air tight seal
  • Built-in locking band to insure a secure fit (no hardware needed)
  • UL1738 approved for category 3 venting applications
  • Limited lifetime warranty

Item # 465010, 4650103, 4650105, 4650107, 4650108

Overall Customer Rating of 21 Reviews:
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Gas Heater Vent Kit

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Good product, instructions were helpful, stainless materials should last a long time.
Quick delivery, too. Would recommend.


Modine heater install with 4in piping kit

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This kit from ACF greenhouses was top notch and very easy to install. I originally ordered an extra 45 deg angle, but where my heater ended up landing I needed the 30deg elbow. The kit was very easy to install and the piping is very high quality. I would recommend to anyone installing a furnace in their house or garage
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Vent kit plus

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I purchased a prepacked 4" stainless steel vent kit along with some additional parts to complete the installation for a hanging furnace in my 40' x 45' hobby garage. The order was shipped immediately and arrived in perfect condition. The kit also came with their "red envelope" of installation guidelines which were very helpful. During the installation process I needed a longer pipe and that was shipped immediately as well. The folks at ACF were great to work with and allowed me to return the pipe from the kit that I didn't need. I highly recommend working with these folks and the ACF Greenhouse Company.
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Modine Horizontal vent install

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Product arrived with no damage to my residence. I ordered an extra 3 inch vent section of 18 inches as I knew I was a little further from my back wall then some who install their heaters. I also ordered the firestop piece of stainless steel and the stainless steel storm collar. I did not like that the wall thimble on the outside of the building only has about 1 inch of flange around the eight inch diameter outer pipe. Knowing how much rain and wind we get here in Washington, I put the firestop over the wall thimble flange to help combat wind and rain around the eight inch hole that I cut in the side of my garage. I then also put the storm collar around the pipe as well. Maybe a little overkill, but water will not be getting into my shop through this vent pipe. Picture of outside and inside install attached. Everything fit like a glove and went smoothly. Expensive stainless vent pipe, but I think it was worth it.
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Vent pipe for Modine Hot Dawg

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I bought this horizontal vent kit for my Modine 45,000 BTU Hot Dawg heater. The piping fitis excellent and goes together effortlessly. The piping fit the 3" exhaust of the Modine perfectly. This is a high quality kit.