Airflow Measurements per Tile Vents

                      

Round tile ventsó12.56 sq. in. air movement per 4î inside diameter opening on the following:

(TV161R3) 37.68 sq. in. total air movement per 3-hole touching 
(TV1613R4) 50.24 sq. in. total air movement per 4 -hole touching
(TV2019R6) 75.36 sq. in. total air movement per 6-hole touching
(TV2820R9) 113.04 sq. in. total air movement per 9-hole touching
(TV187R2) 25.12 sq. in. total air movement per 2-hole non-touching
(TV2019R3) 37.68 sq. in. total air movement per 3-hole non-touching
(TV2920R4) 50.24 sq. in. total air movement per 4-hole non-touching

Half-round tile vents:

(TV2112HR3) 49 sq. in. total air movement per 3-hole half-round tile vent
(TV3017HR6) 102 sq. in. total air movement per 6-hole half-round tile vent
(TV3514HR10) 300 sq. in. total air movement per 10-hole half-round tile vent

              Square tile vents:

(TV2511S2) 72 sq. in. total air movement per 2-square vent
(TV2715S3) 108 sq. in. total air movement per 3-square vent
(TV2921S4) 144 sq. in total air movement per 4-square vent