1 Make four 90 deg mounting flanges out of 3 bid layup. Start with rectangular patches 2 wide x 3 long. Form the patches into angles with the short leg of the angle 3/4 long.
2 Centre the condenser over the plenum opening and mark the location of the condenser attachment flanges.
3 Using 2 bid layup, attach the angle tothe plenum to coincide with the condenser attachment flanges. The short side of the angle is used for conderser attachment.
4 Using hysol or floax , bond the condenser plenum into the fusalge. ref to fir 16.2.A.2