Efficient and effective passive ventilation system
Specifications
| Specification | Objective |
|---|---|
|
Install intake to pull air from the outdoors, which does not include unconditioned spaces such as attics and crawl spaces that are ventilated with the outdoors Install intake: A minimum of 6" from grade; A minimum of 10' from contaminant sources or exhaust outlets; Above local snow or flood line; A minimum of 18" above an asphalt based roof; Never on a flat roof |
Unrestricted entry of contaminant-free air |
| Specification | Objective |
|---|---|
|
Install corrosion resistant screen, louver, or grille material over exterior terminations with a hole size of no less than 1/4" and no greater than 1/2" in any direction |
Prevent pest entry while allowing proper air flow. |
| Specification | Objective |
|---|---|
|
System must contain a backdraft damper between all exterior terminations/intakes that only allows air flow in the desired direction A system of one or more backdraft dampers shall be installed to isolate each dwelling unit from the common duct when the system is not operating |
Prevent unwanted air movement |
| Specification | Objective |
|---|---|
|
Intakes/supplies in dwelling units must minimize potential occupant discomfort and/or drafts |
Minimize client discomfort |