H.sub.2 O.sub.2 as a conditioning agent for electrostatic precip
Hair dryer air filter
Hamper air purification system
Hand vacuum cleaner
Hand-held tool with dust extraction
Handheld cleaning appliance
Handle construction for filter frame
Handling fluid discharged from a conduit at a high velocity
Hard bag door with air directing arrangement
Hard bag door with air directing arrangement
Hazard neutralizing container
Header pipe attachment
Heat and moisture exchanger
Heat energized vapor adsorbent pump
Heat exchange element
Heat exchanger
Heat exchanger
Heat exchanger for a furnace using heat of exhaust gas
Heat exchanger for recovery of heat energy from dust-containing
Heat exchanger water collection system