11 HVAC equipment, namely, grilles, heat registers, diffusers, fans, fan coils, heating coils, hot water reheat coils and ducts, mechanical control systems comprised primarily of pneumatic and digital velocity controllers, air handlers, variable volume terminals, boilers, air conditioners, single duct terminals, filters, radiant panels, chilled sails, chilled beams and radiant heaters, under floor heating systems comprised primarily of grilles, diffusers and fan powered terminal units