1.  Do not use anti-vortex covers, use only anti-entrapment covers.  Anti-vortex covers present a potential hazard for hair entanglement, and the smaller open area of some anti-vortex cover designs results in higher hold down forces (>15 lbs force) should one of the dual drains be blocked by a bather.
 

2.  Dual drains should only be constructed with sumps having 2” connections or larger.  Sumps with less than 2” connections (1-1/2” or less) result in higher hold down forces (>15 lbs force) should one of the dual drains be blocked by a bather.
 

3.  Dual drain connector piping (sump to connector tee) should be 2-1/2” diameter or larger to minimize hold down forces (<15 lbs force) should one of the dual drains be blocked by a bather. 
 

4.  Dual drain separation distances should be minimum 3 feet and should be kept less than 6 feet. Greater separation distances must be compensated for through the use of larger diameter connector piping in order to minimize hold down forces (<15 lbs force) should one of the dual drains be blocked by a bather.

Author: George Pellington

Vac-Alert Industries,  L.L.C.        

January, 2007