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Best product to seal around air con exhaust hose?

I have a portable air conditioner unit that has a flexible exhaust hose that goes to a vent I have made in my wall (the inner wall is plaster, outer wall is fibro).I want to seal the gap around the hose around the inner plaster wall so no hot air comes back in and am wondering what the best product to use would be - would those cans of expandable foam be ok or would a silicon product be better?


Metals can be recycled pretty much indefinablyPlastics only onceNot many plastics are actually recyclable, they need to be the right material and shape or nobody will touch themIt's hard to say with paper because new pulp gets added into the mix with most recycled paper.
As many times as you want!You can do it all the time even as a hobby!But you must always take them to recycle bins if you want to recycle them!Was i helpfull?
Glass can be melted and reused infinity number of times, also many metals, news paper and some types of plastic.
Recyclable material can be recycled infinite number of times - usuallyFor example there's no change in Aluminum that is recycledIn the case of recycled paper it is necessary to add fresh wood pulp, otherwise the recycled paper will be too coarseI believe that even while recycling Aluminum, freshly mined Aluminum is added but that is not necessaryYou will, more or less, get the same grade of aluminum either waysRecycling plastic is a difficult issue and it depends on the type of the plasticBio-degradable plastic, as the name suggests, can be recycled infinitely (plant-plastic-plant-plastic.).
I think you would be better of with the foam insulationSilicon would be suseptable to heat and would leak after a whileThe foam will fill all the cracks and last much longer.

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