The Drolet HT-1600 has an air intake in the back, to the left of the blower cut out. It would be a piece of cake to run an intake from outside air. Is there any benefit to doing that, or should I leave it alone?
Drolet HT1600 air intake
- Thread starter Zorkomatic
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Outside air can help in some cases, especially in a well-sealed house. Here's some light reading on the topic.
Sweep's Library - Why burn outside air?
Should I burn outside combustion air in my stove or fireplace?
hearth.com
Sweep's Library - Outside Air: A Conflicting Opinion?
Is there some kind of disagreement about outside combustion air?
hearth.com
My house was completely remodeled in late 2019 and is very airtight. There are no cold drafts in winter that I know of, except when my wife opens the $#*(*&#$ windows for some reason. So I'm thinking I should be drawing outside air. It's an easy install with one of the kits...
I bought all the parts I need for $39+tax at Lowes. All I need now is the interior cover for the hole, but I can make one myself in my3D printer in less than an hour. I knew that thing would come in handy for something other than Yoda figurines and fancy flower pots for the wife. 
What is the interior cover?
Be sure to put an 1/8" screen on the outside intake to keep out insects, spiders, and vermin.
The box comes with a snap-on critter screen. I could also 3D print another one but the one it came with is fine.
The 4" diameter pipe is inserted through the wall, but the interior hole in the drywall will look rough if I leave it that way, so I make a square or round cover (maybe not the right word) with a 4" hole in white PLA to make it look nice. It's very easy to design in Tinkercad now that I got the hang of it, then I download the model and print it, sand it a bit to make it look pro and install it with some screws. Easy-peasy.
This is what I mean. Took me about 15 minutes to prepare, I just need to make the size a tiny bit smaller to fit my printer. Anyone can download and use them as they wish here: https://www.tinkercad.com/things/ivvv2kbuu4U
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