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HVAC adding flexible duct line to my furnace?
I have a room addition that is not serviced by my floor registers (Slab on Grade). I would like to service the room via my attic using insulated flex duct but I'm not sure how or where on my furnace I would add the duct.
Is this even possible given my furnace feeds immediately into my slab-on-grade floor vents and also If I do tap into furnace adjacent to vent system would or can it adversely affect the rest of my house?
1 Answer
- ?Lv 58 years agoFavorite Answer
The rough rule for determining AC needs is 12,000 Btu's for every 1000 sq. ft. of decently insulated space or 400 sq. ft. if poorly insulated. You can find the Btu's of yours if unknown by calling a dealer of your make and providing the model number.
If yours can handle the extra space then you could install vents in the ceilings with a switch operated centrifugal fan in the duct to pull air from one room into the addition. (if the attics allow you to.) Another fan option are units made to be installed in the walls separating the rooms to transfer the air. You can place those high, low or in the middle.
If your unit is too small then there's small wall mounted ductless heat and cooling units which use a small separate condenser unit set on the ground like their bigger brothers.
Grainger has examples of the above in their on-line catalog.