4.504.1 Covering of duct openings and protection of mechanical equipment during construction. At the time of rough installation, during storage on the construction site and until final startup of the heating, cooling and ventilating equipment, all duct and other related air distribution component openings shall be covered with tape, plastic, sheetmetal or other methods acceptable to the enforcing agency to reduce the amount of water, dust and debris, which may enter the system.
COMMENTARY
Purpose:
This section provides protection for duct openings, permanent mechanical equipment and other components which are often used for conditioning and ventilating during construction. Protection would result in reduced recirculation of construction dust, debris and other airborne contaminants upon occupancy, reduce moisture and water intrusion, and increase operating efficiency.
Examples of Acceptable Methods of Implementation and/or Compliance:
Several methods of protection are acceptable ranging from supply boots to cardboard and duct tape to specially designed rolled sheeting. Protection should have sufficient strength and be securely fastened to provide protection during the timeframe needed.
Equipment, ducting, and plenums should be protected in a method that the protection is successful during the entire construction process.
Equipment stored on the construction site for future installation should be wrapped or protected.
It is recommended that the system not be operated when airborne contaminants are present.
However, if the system is operated during construction, then it is recommended that a high
efficiency filter such as a MERV 6 or 8, suitable for system capacity, be used throughout the construction process and the system be protected after each use. If the system is used prior to final start-up, it is recommended that the entire system, including ductwork, furnace and coil, be thoroughly cleaned and inspected to remove any construction-related particles.
Consider use of alternate space conditioning systems during construction.
Background:
Pollutants caused from construction activities are of major concern as they migrate to the duct systems and air-handling units. Both visible and invisible pollutants can greatly affect indoor air quality when distributed throughout the dwelling by a forced air system. Dust, dirt, and airborne particles can substantially reduce the efficiency and operation of coils and compressors. This practice encourages and provides a method of protection to ensure that the long term mechanical efficiency and occupant health is not adversely affected by construction pollution.
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