You can reshape or extend them as necessary.
Diy gas furnace replacement.
Furnaces consist of two main operating systems.
Most furnace units will already have a gas line run so making sure the connections are secure and there are no leaks will be one of the main safety concern.
In a hot air system a blower forces air through ducts that open into each room.
Remove the door on the front of the furnace cabinet to give you access to the blower it might be on a slide out drawer check the number stamped on the belt and get an exact replacement from a home center or heating supply outlet.
Fixing a malfunctioning blower may be less daunting than you think.
Drain line to your vacuum hose.
The second major safety concern would be ventilation.
Vacuum the furnace burners and the furnace base.
Vacuum everywhere you see dust.
If you are replacing an existing furnace you just need to carefully extract the old furnace from the big metal boxes then seal the new unit to the same boxes.
First turn off all power to the unit and turn off the gas at the gas valve that serves the furnace.
The other for distributing it.
To get at the back of the burners tape a 20 in.
Cool air also called return air gets sucked in through the bottom of the furnace heated and blown out the top supply.
After all blowers are basically just large fans.