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TravelTiger
09-02-2019, 12:43 PM
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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Kathi-27
09-02-2019, 03:56 PM
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

CheapHeat
09-03-2019, 09:06 PM
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 Configuration
Min Total CFM
Max Total CFM
Min # Supply Runs


1800 Watt
120
300
3-4 inch


3750 Watts
180
400
5-4 inch


5000 Watts
240
500
6-4 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 larry@rvcomfortsystems.com
Thank