Specifications include, but are not limited to: Contractor is to install central heating and cooling system to the following specifications that apply. All work preformed will meet the HUD: 24 CFR Part 35: Exempt Activities Section 35.115 (a) (1) through (9) and or not exceed the De minimis levels as stated on Section 39.1350 (d) (1) through (3). A) Each room designed to be living space will have a minimum of one duct and vent except where the size of the room would require more than one. Ducting requirements will be calculated using industry standard duct calculations based on the heat and cooling load required by each room. The exception to this would be in bathrooms where there is electric heat and an electric ventilation fan. The return air grill and thermostat will be placed within the structure in a manner that will allow good air circulation and high performance of the heating and cooling cycle. Contractor will insure system balance by the practice of undercutting doors, installing door grills, or installing jumper ducts. B) The air conditioning will perform to maintain a 20 degree temperature drop, measured at the vent closest to the evaporator, from the outside temperature or a maximum of 85 degrees, whichever is warmer. There should not be an excess of 5 degrees in temperature variation measured at the vent furthest from the evaporator. Heating equipment should be able to maintain a minimum of 68 degrees in each room intended as living space. C) All installations of HVAC equipment must meet the requirements for natural and mechanical ventilation requiring 2 complete air changes per hour with one fifth of the air being outside air. In unusually tight houses, a make-up air duct is required. Contractor to include gas riser and or electrical circuitry, work area and walkway (minimum 5/8 at 24 o.c. floor/ ceiling joints) from the access entrance to the unit. D) All cutting of floors, walls, ceilings and partitions will be kept to a minimum not to exceed De minimis levels and subsequent repair work of blocking and re-inserting cut piece will be performed by the Contractor. All debris and abandoned HVAC equipment will be removed and disposed of by the Contractor. Contractor at no time will cut, drill or notch any supporting framing members without consulting the Housing Inspector.
