Price: $249 - $285
Availability: In Stock - Usually ships in 1 to 2 days.
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, (1) termination tee, (2) 12" vent pipes, and (1) adjustable wall thimble + 18" pipe

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

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 17 Reviews:
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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.

Boise, Idaho

High quality vent kit!

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I am so glad I found this ACF Greenhouses vent kit! I had planned to built a vent kit from scratch but this is so much better with it's integrated gaskets and clamps. The thimble worked well, too. Extremely pleased with this setup.
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Modine Vent Kit

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After many hours of trying to figure out how I was going to vent my new hot dawg heater, I purchased the Modine HD Category 3 Horizontal Vent Kit from ACF Greenhouses. Everything from purchase, to delivery, and install exceeded my expectations. Could not be happier with my experience from them. I highly recommend working with this company and their products. 5 Stars *****

Modine horizontal vent kit

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I was looking for a vent kit with a thimble which would work with 2x6 stud garage walls and one that met or exceeded national safety codes. This kit worked nicely and I was able to customize my installation with the purchase of an extra vent pipe. The only thing which I could suggest is a trim plate to cover the outside thimble.

No problems

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Installation very straight forward, parts appear well made and being stainless is a big factor.
I like the seals between the pipes, much better than just a clamp.