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Mr. Heater Big Maxx-Pack Steel Garage Heater Vent Kit

20 Reviews
  • Vertical ventilation kit for the Big Maxx MHU80NG/LP Garage Heater
  • Adjustable vent kit that fits most garages and installations
  • Adjustable roof flashing

$101.15

Complete 4-in vertical single and B-vent ducting for unit heater.
  • Vertical ventilation kit for the Big Maxx MHU80NG/LP Garage Heater
  • Adjustable vent kit that fits most garages and installations
  • Adjustable roof flashing
  • Convenient packaging
  • This kit provides the pieces needed for an average installation – additional pieces may be needed
Weight 13.3 lbs
Dimensions 6.7 × 13.8 × 37.1 in

Latest reviews

  1. cgoldn

    This kit has everything needed to vent horizontally only. The only parts applicable to a vertical installation is 1 piece of dual wall “b-vent” pipe, the flashing, cap and storm collar. If you purchase this kit, and plan to vent vertically you will need the following items: 1T fitting, 1 inside cap, a ceiling fire stop, a b-vent draft hood connector, and several more pieces of b-vent piping so that your pipe above the roof line is at the appropriate level for your pitch of roof. If you use this kit only (without purchasing additional items above) to vent vertically, you will face condensation problems inside the elbow, which will result in corrosion of your pipe potentially leading to a carbon monoxide leak due to rust-out. Additionally, Selkirk does not recommend this type of application for a fan exhausted unit heater specifically due to excess condensation build up. Lowe’s was very helpful with my concerns. They’ve refunded the kit completely, I’ve requested the contact the manufacturer and remove the falsely advertised “vertical vent kit” label from the box. There are very few instructions within this kit that detail all of the above info.

  2. Damon

    Very easy to install and work well for my application.

  3. Misfit666

    All you need in one kit, easy to use. High quality for a decent price.

  4. IRRITATED

    This kit shows a wall thimble doesn’t come with one , it also shows a 3” to 4” inch adapter that is not included either ! So the hardest parts to get are not included tis tis please fix the picture !

  5. Shoe

    Looks to be as advertised. Haven’t had time to do anything with it yet.

  6. cgoldn

    This kit has everything needed to vent horizontally only. The only parts applicable to a vertical installation is 1 piece of dual wall “b-vent” pipe, the flashing, cap and storm collar. If you purchase this kit, and plan to vent vertically you will need the following items: 1T fitting, 1 inside cap, a ceiling fire stop, a b-vent draft hood connector, and several more pieces of b-vent piping so that your pipe above the roof line is at the appropriate level for your pitch of roof. If you use this kit only (without purchasing additional items above) to vent vertically, you will face condensation problems inside the elbow, which will result in corrosion of your pipe potentially leading to a carbon monoxide leak due to rust-out. Additionally, Selkirk does not recommend this type of application for a fan exhausted unit heater specifically due to excess condensation build up. Lowe’s was very helpful with my concerns. They’ve refunded the kit completely, I’ve requested the contact the manufacturer and remove the falsely advertised “vertical vent kit” label from the box. There are very few instructions within this kit that detail all of the above info.

  7. Damon

    Very easy to install and work well for my application.

  8. Misfit666

    All you need in one kit, easy to use. High quality for a decent price.

  9. IRRITATED

    This kit shows a wall thimble doesn’t come with one , it also shows a 3” to 4” inch adapter that is not included either ! So the hardest parts to get are not included tis tis please fix the picture !

  10. Shoe

    Looks to be as advertised. Haven’t had time to do anything with it yet.

  11. cgoldn

    This kit has everything needed to vent horizontally only. The only parts applicable to a vertical installation is 1 piece of dual wall “b-vent” pipe, the flashing, cap and storm collar. If you purchase this kit, and plan to vent vertically you will need the following items: 1T fitting, 1 inside cap, a ceiling fire stop, a b-vent draft hood connector, and several more pieces of b-vent piping so that your pipe above the roof line is at the appropriate level for your pitch of roof. If you use this kit only (without purchasing additional items above) to vent vertically, you will face condensation problems inside the elbow, which will result in corrosion of your pipe potentially leading to a carbon monoxide leak due to rust-out. Additionally, Selkirk does not recommend this type of application for a fan exhausted unit heater specifically due to excess condensation build up. Lowe’s was very helpful with my concerns. They’ve refunded the kit completely, I’ve requested the contact the manufacturer and remove the falsely advertised “vertical vent kit” label from the box. There are very few instructions within this kit that detail all of the above info.

  12. Damon

    Very easy to install and work well for my application.

  13. Misfit666

    All you need in one kit, easy to use. High quality for a decent price.

  14. IRRITATED

    This kit shows a wall thimble doesn’t come with one , it also shows a 3” to 4” inch adapter that is not included either ! So the hardest parts to get are not included tis tis please fix the picture !

  15. Shoe

    Looks to be as advertised. Haven’t had time to do anything with it yet.

  16. cgoldn

    This kit has everything needed to vent horizontally only. The only parts applicable to a vertical installation is 1 piece of dual wall “b-vent” pipe, the flashing, cap and storm collar. If you purchase this kit, and plan to vent vertically you will need the following items: 1T fitting, 1 inside cap, a ceiling fire stop, a b-vent draft hood connector, and several more pieces of b-vent piping so that your pipe above the roof line is at the appropriate level for your pitch of roof. If you use this kit only (without purchasing additional items above) to vent vertically, you will face condensation problems inside the elbow, which will result in corrosion of your pipe potentially leading to a carbon monoxide leak due to rust-out. Additionally, Selkirk does not recommend this type of application for a fan exhausted unit heater specifically due to excess condensation build up. Lowe’s was very helpful with my concerns. They’ve refunded the kit completely, I’ve requested the contact the manufacturer and remove the falsely advertised “vertical vent kit” label from the box. There are very few instructions within this kit that detail all of the above info.

  17. Damon

    Very easy to install and work well for my application.

  18. Misfit666

    All you need in one kit, easy to use. High quality for a decent price.

  19. IRRITATED

    This kit shows a wall thimble doesn’t come with one , it also shows a 3” to 4” inch adapter that is not included either ! So the hardest parts to get are not included tis tis please fix the picture !

  20. Shoe

    Looks to be as advertised. Haven’t had time to do anything with it yet.

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