[thx138]

Yesterday we installed a ductless mini split in my workshop/garage and everything works great but I have a question. The plastic wall grommet where the wires, drain and lines run out side needs to be filled in ti stop outside air from coming in, whats the best material to use for this. I think expanding foam would be a nightmare if I ever needed to remove it but I am looking for advice.

 

[yuri]

White silicone. Buy the more expensive indoor/outdoor type not the cheapest bathtub type.

 

[thx138]

White silicone. Buy the more expensive indoor/outdoor type not the cheapest bathtub type.

I have DAP Alex Plus here, is that good enough?

 

[yuri]

I Googled it and yeah it looks good.

 

[Porsche986S]

Are the line sets/drain hose running in any kind of vinyl cover on the outside of the building ? When I did mine in my garage the lines all fit inside of a vinyl chaise made specifically for this . Up near the top where it all enters the building you wrap it in insulation . You can wrap the entire run if you want to . When you snap on the outside cover it squeezes the insulation and makes the seal . Yes you can use caulk but what a mess to dig out if any repairs are needed in the future .

 

[thx138]

I Googled it and yeah it looks good.

Thanks, I never know what is considered more expensive. I try not to buy junk because I hate buying things twice.

Are the line sets/drain hose running in any kind of vinyl cover on the outside of the building ? When I did mine in my garage the lines all fit inside of a vinyl chaise made specifically for this . Up near the top where it all enters the building you wrap it in insulation . You can wrap the entire run if you want to . When you snap on the outside cover it squeezes the insulation and makes the seal . Yes you can use caulk but what a mess to dig out if any repairs are needed in the future .

With exception to the drain everything is in a vinyl sleeve and that is going through the plastic grommet thing. I have no outside cover that came with it but I did purchase a housing to cover the lines going to the outdoor unit. I have pink foam insulation, I may try cutting rings of that to fill in the gap and seal that with silicone. I think it would take 2 tubes if I used all silicone to fill it in.

 

[jjrbus]

I wrapped each line in kitchen type plastic wrap, the clingy stuff, as I installed and then did the caulk and foam.



Instead of filling the entire cavity could possibly put just enough foam to seal to the outside?