Rivernerd Posted January 27 Share Posted January 27 After reviewing some posts asking why RV furnaces have no air filters, I decided to add one to our Truma Varioheat furnace. Home furnaces have filters to protect the motors and fans from dust accumulation, why not RV furnaces? My filter consists of a piece of filter fabric cut to size and attached to the front of the cold air intake with "No Residue" duct tape. See photo below. Here is what the furnace looked like before installation of the filter: I tested the furnace after installation, and noted no difference in its operation. I will be interested to see, over time, if the filter collects a noticeable amount of dust. I would rather have the dust collect in the filter than on the fan and motor! The filter fabric is available here for seven bucks: https://smile.amazon.com/dp/B077SP23FP?ref=ppx_yo2ov_dt_b_product_details&th=1 The 4'x1' piece I received includes enough for many years of filter changes. I welcome any comments, in favor or against, the use of such a filter. 4 Hull #1291 Central Idaho 2022 Elite II Tow Vehicle: 2019 Tundra Double Cab 4x4, 5.7L with tow package Link to comment Share on other sites More sharing options...
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