The standard air handler casing is fabricated from a minimum of 16-gauge paint ready galvanized steel and features a bolted, standing-seam construction. Optional materials include aluminum and stainless steel. Each panel is pre-punched and securely bolted to provide both an air and water tight seal.

Panels have return break seams, which encapsulate the raw edges of the insulation and ensure cabinet rigidity. Unit casings are designed and manufactured for a maximum leakage rate of less than 1%, up to 1.5 times the designed static pressure.

Roofs are reinforced with heavy-gauge steel channels to ensure rigidity. All panels feature bolted standing seam construction to permit complete disassembly of any section.

To prevent water penetration, roof panels are bolted to casing flanges assuring no penetrations of the air tunnel and drive cleats cover all roof panel seams. Roofs on weatherproof units are sloped at 1/4" per foot to ensure proper water drainage.

Each unit casing is insulated with a minimum of 2", 1-1/2 lb/ft3 density, NFPA 90A approved thermal/acoustic insulation glued directly to the casing.

All raw edges of the insulation are captured by the return break seams of the unit panel, eliminating exposure of raw fiberglass to the air stream. Other types of insulation are available upon request.