Infinity Drain Linear Drain Guide - Manual (Page 5)

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Flow Rates:
There are many variables that influence flow rates and how drains perform. Our listed GPM (gallons per
minute) on Infinity Drain products are based on having a ”head of water” that is traveling a ½” high. Different
head heights will change flow rate. Without calculating a specific install, use our flow rate as a general
guideline. The following variables below should be considered when choosing and locating a linear drain.
Variables to consider:
What is flow rate of the shower valve? (i.e. how much water is being drained?)
Are there multiple shower valves?
What is the water pressure or PSI of the site location?
How many water features? (i.e. showerheads, hand shower, body sprays, etc.?)
Will the fixtures operate at the local plumbing code’s legal gallons per minute?
Will the flow restrictors be removed from the fixtures?
The answers to the above questions fall into the equation of determining the proper type of drain, outlets
necessary, and location of the drain. These variables can vary drastically from installation to installation,
and because of this, it is difficult to have an absolute flow rate. Most US residential installations use a 2”
waste line, which has an average capacity of 9 GPM at ½” head of water, assuming proper venting. Adding
additional 2” outlets and tying them to a 3” waste line will significantly increase the flow rate to 21 GPM.
Infinity Drain’s 3” outlet products have an average capacity of 21 GPM.
Infinity Drain products that achieve a higher flow rate without adding a second outlet:
S-DGAS 99 S-TIF AS 99 S- AS 99
FX 125 FF 125 TD 20-3
Outlets:
Infinity Drain products are intended for both indoor and outdoor use. For indoor installations, we
recommend an outlet every 30”. For example, on a 60” length drain, if the outlet is centered, it is
considered to have 30” on either side. In the same example, if the outlet is offset 5” to one side, we
would recommend a secondary outlet, especially for a threshold installation. Our 72”, 80”, and 96” kits
come standard with two outlet assemblies. Site Sizeable (S) Series can add additional outlet components
to the kit. We can custom fabricate the FX, FF, and FT linear drain series with multiple outlets. Outdoor
installations: Outlet frequency is dependent on drain application and geographic location. Please contact
us with questions regarding your specific installation.
Waterproofing:
The type of waterproofing can help determine which linear drain series (S, FX, FF, FT) to specify. If using a
traditional type of waterproofing, the professional will typically build a shower pan (wet waterproofed area)
with PVC, Vinyl, Lead, Hot Mop, Copper or Fiberglass material. Infinity Drain’s S, FX, and TD Series are
recommended. If using a modern type of waterproofing such as liquid or a fabric install, the professional
can more easily waterproof over a greater floor area to build a barrier free or zero threshold installation.
Infinity Drain’s FF, FT, and TDB Series are recommended for this type of waterproofing.
Linear Drain Guide