Slide 1

Go With The Flow sequel to Gone With The Wind A Primer on All the Important Things You Never Wanted to Know About Outdoor Air Supply A Primer on All the Important Things You Never Wanted to Know About Outdoor Air Supply Slide 2 O.A. Supply Adequate? Go With The Flow Vital function Many parts Complex Designed to allow adequate airflow Airflow Example Key Question Slide 3 O.A. Supply Adequate? Go With The Flow Key Messages Ventilation with outdoor air is important Most schools lack adequate O.A. Continuous path is critical You play a role Slide 4 O.A. Supply Adequate? Go With The Flow Remember... In the stock market, up is good and down is bad The same with the amount of outdoor air supply, up is good and down is bad LO HI Good Bad Slide 5 O.A. Supply Adequate? Go With The Flow How Much is Adequate? ASHRAE Standard 62 is the standard 62-1989R = 15 CFM per Person Ventilation rates are MINIMUMS, not maximums Slide 6 O.A. Supply Adequate? Go With The Flow Continuous Path There has to be a continuous path from outdoors to outdoors Slide 7 O.A. Supply Adequate? Go With The Flow Continuous Path Slide 8 O.A. Supply Adequate? Go With The Flow Blocked Intake Grille Common practice after oil embargo in 1972 Easy to identify Removal could make big difference in IAQ Slide 9 O.A. Supply Adequate? Go With The Flow Blocked Intake Screen Hard to see Purpose is to prevent bird, rodent, and big debris entry Often clogged with small debris Slide 10 O.A. Supply Adequate? Go With The Flow Clogged Air Filters Extended-area filters are better Preventive maintenance schedule is important Slide 11 O.A. Supply Adequate? Go With The Flow Mis-Set Time Clocks 24 hour and weekly styles Power-outages, daylight savings time, and others can cause OA to be OFF when needed, and ON when not Slide 12 O.A. Supply Adequate? Go With The Flow Blocked Supply Grille Tops of unit ventilators often used as storage space Sometimes purposely blocked due to discomfort or noise Slide 13 O.A. Supply Adequate? Go With The Flow Continuous Path 3 potential transfer choke- points for outdoor air supply Slide 14 O.A. Supply Adequate? Go With The Flow Blocked Transfer Grilles Part of unit ventilator and exhaust-only systems Sometime contain fire dampers which have been triggered (closed) Slide 15 O.A. Supply Adequate? Go With The Flow Blocked Transfer Paths Most pre-1970s schools had various forms of air transfer paths out of occupied areas Most transfers have been defeated by fire marshalls Slide 16 O.A. Supply Adequate? Go With The Flow Continuous Path 5 potential exhaust choke-points for outdoor air supply Slide 17 O.A. Supply Adequate? Go With The Flow Fans Turned Off Check the breaker panel inside the building, and the disconnect next to the fan Slide 18 O.A. Supply Adequate? Go With The Flow Broken Fan or Belt Preventive maintenance is important for belts Slide 19 O.A. Supply Adequate? Go With The Flow Finally??? We completed the path from outdoors-to- outdoors, so the outdoor air supply is now adequate, right?! Slide 20 O.A. Supply Adequate? Go With The Flow Educate Others Example: Path is complete, but occupants turn unit off due to noise or discomfort Youve educated occupants, so OA is now adequate, right? Slide 21 O.A. Supply Adequate? Go With The Flow Outdoor Airflow Measurement You cant look and guess at the amount --- IT HAS TO BE MEASURED ! Dont expect 15 CFM per person Slide 22 O.A. Supply Adequate? Go With The Flow Connection to Kit The points outlined is this presentation are the same points covered by the Ventilation Check- list and Video Drawings are from IAQ Backgrounder