Greetings to everyone,
Background:
I have been doing some research on environmentally friendly ductwork installations and have seen many arguments against using uncoated duct board. The disadvantages range from a breeding ground for dust mites and mold to inhalation of micro fiber particles and formaldehyde.
As I have a newborn in my household and my duct board boxes and lined flex hose are all black on the inside, I am looking to replace the entire ductwork system. My ductwork is in the attic and will primarily be used for cooling a small 1300 sq/ft Florida home.
The entire current system is all lined flex hose connected with triangular duct board junction boxes and terminated with duct board register boots.
Questions:
- What are my options for replacing the junctions, plenum, and register boots with non fibrous duct board material?
- If it's sheet metal, is there a way to insulate them just on the outside up to R6?
- My longest current flex hose run is about 11 feet. Is it possible to design a system using only flex hose that is properly sized?
Example:
10 Ft. |===============|Boot 1| || 9Ft. || Plenum =======|Triangle Junction| || || || || 5Ft.|| |============|Boot 2| || 11 Ft. || |Boot 3|Thank you in advance for any suggestions,
Dmitry