New duct run


Founding Texas-West Chapter Leaders
For those who did the CheapHeat install themselves, for the additional duct, what did you buy and where did you get it?

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Well-known member
got 4 inch insulated flex duct at lowes. Also got 3 inch non insulated on amazon for the under belly duct to run back further


HOC Vendor Partner
Any ducting you add should be 4 inch duct which you can buy at Home Depot or Lowes, its just Mylar dryer vent hose.
That being said the minimum duct requirements are as follows:
Heat Range ConfigurationMin Total CFMMax Total CFMMin # Supply Runs
1800 Watt1203003-4 inch
3750 Watts1804005-4 inch
5000 Watts2405006-4 inch
Its not uncommon to have to add at least one duct and if that the case we suggest you just shove it open ended back under the living area towards the back of the RV. Its above the insulation so there is no lost heat, just warmer floors.
if you have any technical questions you can always contact me at PH# 425-408-3140 or