Muza Sheet Metal Co. has been designing, fabricating, and installing Industrial and Commercial HVAC systems since 1928. We constantly strive to work with the customer to make the entire staff is happy with the comfort of the tempered air at their work space. We retrofit existing systems, design and install new systems, or just rebalance systems that have been giving the customer troubles. From filtration, humidity, outdoor air, zone systems, diffusion and comfort Muza Sheet Metal Co will turn your HVAC problems into our promise for your satisfaction.

The main purposes of a Heating, Ventilation, and Air-Conditioning (HVAC) system are to help maintain good indoor air quality through adequate ventilation with filtration and provide thermal comfort. HVAC systems are among the largest energy consumers in schools. The choice and design of the HVAC system can also affect many other high performance goals, including water consumption (water cooled air conditioning equipment) and acoustics.

The following actions detail how engineers can design a quality system that is cost-competitive with traditional ventilation designs, while successfully providing an appropriate quantity and quality of outdoor air, lower energy costs, and easier maintenance.

Codes and Standards

The national consensus standard for outside air ventilation is ASHRAE Standard 62.1-200, Ventilation for Acceptable Indoor Air Quality (available online via and its published Addenda. This standard is often incorporated into state and local building codes, and specifies the amounts of outside air that must be provided by natural or mechanical ventilation systems to various areas of the school, including classrooms, gymnasiums, kitchens and other special use areas.

  • Design in accordance with ASHRAE standards Design systems to provide outdoor air ventilation in accord with ASHRAE Standard 62.1-2007 (available at and thermal comfort in accord with ASHRAE Standard 55–1992 (with 1995 Addenda) Thermal Environmental Conditions for Human Occupancy.
  • Ensure familiarity with, and adherence to, all state and local building codes and standards.
  • Designers should consider the use of natural ventilation and operable windows to supplement mechanical ventilation. Consider outdoor sources of pollutants (including building exhausts and vehicle traffic) and noise when determining if and where to provide operable windows.
  • If operable windows will be used to supplement the HVAC system, ensure that:
    • Openings for outdoor air are located between 3-6 feet from the floor (head height)
    • The windows are adjustable and can close tightly and securely
    • The windows are placed to take maximum advantage of wind direction, with openings on opposite sides of the building to maximize cross-ventilation.