Question

I have a question about tapping into one of my furnace ducts located in my attic.  I want to add heat to a room that has been added by enclosing a porch.  It is about 35 feet from the tie in point to the center of the room that I want to heat.  Will it be necessary to add some sort of fan at the connection point to move the air along the new 35 foot duct to get it to the new location?  Or will it be just fine to tie in and forget it?

Answer

IF you are referring to connecting to a 6 inch round to a 4 inch round, it would be more effective to connect to a main duct. By main duct, I refer to the large rectangular ducting. If you steal air from the room that has the 6 inch duct, may create a comfort problem in that particular room.  I duct booster (fan) should not be necessary.  You may want to include a volume damper to ensure that you can adjust the volume of air as required.  The volume boosters can be purchased at either Lowe's or Home Depot.   Don't forget for all your need in regard to Heating and Cooling Services, please remember Smiley Heating and Cooling.