lindab | we simplify construction Flow measuring unit-rectangular FRA Dimensions Side view Front view d b d Description FRA is a measuring unit with a measuring cross, which is used for measuring volume flow in rectangular ducts. FRA is equipped with a Belimo VRD3, which provides an output signal that is proportional to the volume flow. The FRA needs a certain distance of straight duct before the unit and this has to be observed to obtain a stable and accurate air flow regulation. • Requires minimal initial pressure (<20 Pa at V nom ). • Output signal indicates actual volumeflow. L FRA d a d c NB! Different flange types are available, see order code and dimension table below. a and b dimensions, see order code. Dimension table d Flange type LS 20 RJFP20 20 RJFP30 30 RJFP40 40 Table 1. FRA flange types and dimensions. L FRA c mm 341 341 102 342 343 Installation Using LS-profile. Installation instruction, please go to Asembly instruction, Rectangular air duct systems, LS-profile. Using RJFP-profiles. Installation instruction, please go to to Lindab rectangular duct systems, RJFP. You can find general information about air duct systems, theory calculations following this link. Order code - FRA Product Type F RA FRA aaa x bbb Dimension Min. : a x b = 300 x 100 mm Max. : a + b ≤ 2400 mm and a ≤ 1500 mm Motor type VRD3 (Standard) Flange type LS RJFP 20 RJFP 30 RJFP 40 (Standard All sizes ) When a or b > 800 On request VRD3 Example: FRA-500x200-VRD3-RJFP 20 dddd Lindab reserves the right to make changes without prior notice 1 2020-10-30
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