How would you seal this gap?

[00Dan]

BLUF: soliciting ideas for sealing the cowl to airbox gap on a Cessna style airbox (pictured below).

My old -4 has a Cessna style airbox with a large gap around the perimeter of the filter that allows air into the lower cowl plenum. I’m chasing some lower cowl pressure issues and this seemed like an easy target to seal up. So far I’ve tried duct tape, aluminum tape, and an RTV impregnated fiberglass seal; none have proven effective in sealing this gap, either still allowing air past or not withstanding the movement of the airbox relative to the the cowl and tearing. Any suggestions? I know this configuration is rare on RVs now days.

[bjdecker]

I've used baffle material / airseal fabric (Van's Store -- https://store.vansaircraft.com/airse...ric-12x56.html)

You can make all kinds of seals with this stuff. Just keep in mind the amount of shake/rattle/roll the airfilter exhibits and let the material move with it.