Test Hole



These test holes make it easy and economical to provide openings for piton tubes and other test instruments, to measure static pressures and air velocities. The hole is sealed off with a heavy screw cap and gasket. Unless otherwise specified a flat gasket is supplied to prevent air leakage around the base. For an extra charge, special gaskets are available to adapt these test holes to round duct. Weight per 100, 36 lbs. These test holes are now available in two sizes: #699 with a total height of 1 5/8" is made for two inches of insulation. Weight per 100, 48lbs.