Not really sure what you are trying to do. If you want to make a bigger hole, trace and cut it. If you want to go from a 4" vent to 6" then you can buy adapters from Home Depot, Lowes, Menards, ect.
i have a 4'' hole in a 4x4x7 tent , i got a new fan that is 6'' & i want to make it bigger .
the ones like you can screw together if you know i mean :)
I think that you are talking about 6" flanges for your tent which bolt together? if that is the case than they have fairly good prices at htgsupply.com I hope that helps.
bingiman i had a look & no 6'' thx anyways , i think ur right abought the flanges .
if i put the 2 6'' flanges together won't it tear the panda film from moving around after a wile
You may be able to use a collar instead. I'm not positive since
they are made to tie into ductboard.
Might be able to engineer it though for your purpose.
I've never used a tent so I'm not sure if it could work for that.