Re: Removing return and supply Duct work questions
There shouldn't be any issues regarding the safe operation per se -- especially if this direct vent is both the combustion air and exhaust.
Originally Posted by bobphoto
It's done regularly around these parts --- either with an existing or temporary furnace while renovations take place.
A tip --- keep alot of furnace filters on hand and change them frequent as they will get plugged with all the dust being raised during the demo and construction. Another thing would be to attach filters to the open returns which reduces the amount of dust being drawn into the return air system.
Caution -- if you plan to use any type of paint stripping chemicals or similar corrosive chemicals during the reno then there's a good chance the heat exchanger in the furnace will get damaged.
Also, the remaining ducting should be throughly cleaned after construction if they will remain in place.
Then and again --- have the furnace throughly inspected after construction to see if it survived and possibly change out all the ducting.
Hopefully this helps.
"" an ounce of perception -- a pound of obscure "