Manufacturers
Acme
  Galvanized Duct, Pipe and Elbows
Aire Technologies
  UL Listed Fire Dampers & Assemblies
Airtec Products
  Plastic Diffusers and return grilles
Allied Air
  Gas & Electric Rooftop Heating & Air Conditioning Units; Gas Fired Unit Heaters
American Saw
  Lenox Saw Blades and Hand Tools
Aprilaire
  Commercial and Residential
  Whole house air solutions, humidifiers, air cleaners, Dehumidifiers, Zone Control , Thermostats
Armstrong Air
  Furnaces - Gas, Oil, Electric
Air Conditioning Systems
Artis Metals
  Single wall Chimney flashings, collars and caps
Broan
  Exhaust Fans, Wall and Roof Caps
Butler Ventamatic
  Roof exhaust fans
C & S Manufacturing
  Basset Brackets, Pipe & Duct Hangers
Cambridge Lee
  Copper Linsets
CertainTeed
  Insulated Duct wrap and liner
Cesco Products
  Control Dampers, Louvers, Backdraft Dampers, UL Listed fire,fire/smoke dampers
Continental Fan
  Centrifugal Exhaust Fans
Deflecto
  Dryer Vent Hoods and Intakes
Ductmate
  Rectangular & Round Duct Connector Systems(WDCI & Ductmate), Duct Sealers& Adhesives, Turn Van & Rail, Grease Duct Access Doors, Weld Pins
Duro-Dyne
  Sheet metal machinery, Screws, Adhesives, Flexible duct connector, Access doors,
Dampers regular sets, Weld Pins
Econar
  Cold Climate GeoSource Heat Pumps
Erico
  Caddy Fasteners (Hanging & Support Systems)
Fantech
  Heat & Energy Recovery Ventilators
Field Controls
  Power Venters, Barometric Dampers, Booster Fans, UV Air Units
Hart & Cooley
  Registers & Grilles, B-Vent Chimneys, Chimney Liners, Insulated & Non Insulated Flexible Ducts
Honeywell Genesis Cable
  Plenum rated and 18Ga. Thermostat Wire
Kelvinator
  Gas Furnaces, Air Conditioning Systems
Klein Tools
  Hand Tools
Krueger
  Commercial & Industrial Registers, grilles,spiral duct diffusers, VAV & Terminal Units (Single & Dual Duct, Fan Powered Bypass/Retrofit), VSV Diffusers
Kirk & Blum
  Forever Duct (Sealed Round Duct System) Angle rings, blast gates for duct collecting systems
Little Giant
  Condensate Pumps, Drain Pan Safety Switchs
Lloyd Industries 
  Fire & Smoke Dampers, Air Control Dampers, Access Panals
Lukjan Metals
  26 Ga. & 30 Ga. Snaplock pipe& fittings
Magic-Pak
  Thru the wall packaged heating & air conditioning units ( ideal for multi-storied apartment buildings) available in gas, electric or heat pumps  
Malco 
  Full line of sheet metal tools, screws and rivets
Napoleon
  Gas and wood fireplaces, inserts, stoves
Pellet Stoves
Nu Calgon
  Coil Cleaners, chemicals
Omega Flex 
  TracPipe, a flexible stainless steel pipe for natural or propane gas
Precisionaire 
  Flanders air filters, pleated, HEPA
Q-Mark-Berko
  Electric Heating Products (Industrial,Commercial, Residential)
Rehau 
  Radiant Heating and Ice Melt Systems
Rectorseal
  Furnace cement, Glue/Cleaners, Fire Caulk
Roberts Gordon
  High & Low Infra Red Tube and Garage Heaters, Direct & Indirect Fired Make-Up Air, Sealed Combustion Unit Heaters
Soler & Palau
  Exhaust & Supply Fans (Commercial, Industrail & Institutional) Downblast, Upblast, Cabinet & Inline Fans, Louvered Penthouses, Kitchen Exhaust & Make-Up Air
Spacepak 
  Hi velocity air conditioning systems
Sila Seal
  Silcone Caulks
Comfort Star
  Comfort Star Ductless Split Systems
Venture Tape
  Aluminum Foil FSK, UL181 Tape, Duct Tape & Flue Pipe Tape
White Rodgers
  Heating & Air Conditioning Thermostats and Controls
Z-Flex
  Aluminum & Stainless Steel Chimney Liners