Wayne Parham Messages: 18835 Registered: January 2001
Illuminati (33rd Degree)
Loosely pack the sides, top and bottom surrounding the flare with insulation:
Midhorn packed with insulation and rubber ball brace in place
The picture above doesn't show the gasket, but one is used to seal the access panel. A suitable material for this purpose is PVC sheet rubber, commonly used for shower pans. You can get it at most builder's supply houses and cut it to fit. Makes excellent gasket material.
PVC sheet rubber, cut to form a 12π side panel gasket