hvac fresh air intake requirementsBlog

hvac fresh air intake requirements

Let’s clean the air and reduce the problems.Whether it’s a new installation or routine service, our factory-trained technicians provide the expertise your comfort depends on, and Lyons A/C & Heating, we repair all makes and models. Both types of natural ventilation require careful engineering to ensure convective flows. Windows that open and close can enhance occupants' sense of well-being and feeling of control over their environment. HVAC systems are among the largest energy consumers in schools. Special use areas such as science labs, vocational/technical shops, cafeterias and indoor pools already have well established regulatory codes regarding ventilation with outdoor air and negative pressure requirements with respect to adjacent spaces. Yet nearly all school ventilation systems cannot indicate whether outdoor air is even being supplied to the school, much less gauge the quantity of that air. Don’t I get enough fresh air from just opening and closing doors? Fresh Air is brought into the attic return through a 5″ pleated filter. Combinations of these effects can even cause the intake system to actually exhaust air.Uncontrolled moisture indoors can cause major damage to the building structure, as well as to furnishings and to finish materials like floors, walls and ceilings. They will be happy to filter the contaminants, but the more you breathe these contaminants, the sicker you get. One technique for doing this is to install carbon dioxide (COIf an auditorium fills up for school assembly, then COIn addition to "atmospheric dust," airborne particulates can include pollen, mold (fungal) spores, animal dander, insect proteins, pesticides, lead and infectious bacteria and viruses. "AHU" refers to any air handling unit that is associated with outdoor air supply.The number or name of the AHU (e.g., AHU ##, or AHU for West Wing)The outdoor air (OA), supply air (SA), return air (RA) and exhaust or relief air (EA) connections to the AHU, each with arrows noting proper airflow directionThe access door(s) for the air filters and the minimum filter dust-spot (or MERV) efficiency (Air Filters, minimum xx% dust spot efficiency)The filter pressure gauge and the recommended filter change pressure (Filter Pressure, max 0.x in. )The access door(s) for the condensate drain pan (Drain Pan)Other pertinent access doors such as to energy recovery ventilation wheels or plates (Energy Recovery Ventilation Unit)The minimum amount of outdoor air for each AHU (### CFM minimum during occupied times)The outdoor air damper (OA Damper), with special marks noting when the damper is in the fully closed (Closed), fully opened (open) and minimum designed position (Min)If a motorized relief damper is installed (EA Damper), note the same positions as above.The access door to any outdoor air controls (OA Control(s)) such as damper position adjustments, outdoor airflow measuring stations, resets, fuses and switches)Breakers for exhaust fans (Exhaust Fan ##), AHU, unit ventilatorsAccess doors for inspection and maintenance of air ductsAny dampers and controls for air side economizers (as appropriate)The number or name of all exhaust fans, including the air quantity exhausted (EF##, ###CFM)Building commissioning is a quality assurance program that is intended to show that the building is constructed and performs as designed. Demand controlled ventilation is addressed as a method of humidity control, but is not otherwise discussed here because its primary use is to reduce the supply of outdoor air below the recommended minimum for the purposes of saving energy, not for improving IAQ.Supplying acceptable quantities of outdoor air to occupied spaces is a critical component of good indoor air quality.

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