HVAC unit consists of mechanical parts like Heat exchanger, Blower motor, Compressor, Coils, thermostat and etc. Insulations and sealants find applications for such mechanical parts for locking, sealing and bonding. Such heavy equipment generates vibrations and noise which needs to be addressed.

Further these components are assembled, fabricated into packaged units and connected to complicated ducting systems. These ducts finally terminate as grills etc hanging from pipes or fixed onto walls/ false ceilings.

Efficiency of HVAC system largely depends upon how this air is sealed and that there are no air leakage losses. Air leakage loss implies more work for the engineering components, more energy consumption, more wear & tear.