does adding polyfill change port tuning?

[shizzzon 10+ year member]

After polyfill testing is complete.. i will be doing another type of testing-

Bellmouth port testing. It's like aeroports for square vents.

I got a guy in my area that will custom make any size of Bellmouth port for my wall REAL CHEAP...

The bottom pic is an example of a Bellmouth port for my wall-

They have to be slightly modified to kill potential resonance for acoustical uses but besides that, in a few weeks i'll be testing these for more results.

 

[dappa5 10+ year member]

After polyfill testing is complete.. i will be doing another type of testing-
Bellmouth port testing. It's like aeroports for square vents.

I got a guy in my area that will custom make any size of Bellmouth port for my wall REAL CHEAP...

The bottom pic is an example of a Bellmouth port for my wall-

They have to be slightly modified to kill potential resonance for acoustical uses but besides that, in a few weeks i'll be testing these for more results.

sombody has been to the HVAC store lol G/L w/that