04/2014 US K5 – 2.1 – 11
Specification text VFL
Circular volume flow limiters in 5 nominal sizes,
made of high-quality plastic, to limit and control
volume flows in air conditioning systems.
Ready-to-commission unit consists of the casing
with volume flow rate setting scale and the control
mechanism with leaf spring and low-friction,
silicone-free bellows.
Easy insertion into circular ducts to EN 1506
or EN 13180; secure fit ensured by a lip seal.
Aerodynamically tested and factory set to a
reference volume flow rate. Can be subsequently
accurately adjusted within a volume flow rate
range of at least 5 : 1.
Special features
– Mechanical self-powered
– Low-friction bellows
– For circular ducts
– Lip seal for tight and secure fit
– Aerodynamically tested and factory set
to a reference volume flow rate
– Sticker showing volume flow rates (in l/s,
m³/h and cfm) on each unit
Materials and surfaces
– Casing and damper blade made of high-quality
plastic, to UL 94, V1; to DIN 4102,
material classification B2
– Leaf spring made of stainless steel
– Polyurethane bellows
Technical data
– Nominal sizes: 4 – 10 in
– Volume flow rate range: 11-450 cfm; 5 – 212 l/s
or 18 – 764 m³/h
– Volume flow rate control range: < 20 to 100 %
of the nominal volume flow rate
– Volume flow rate accuracy: approx. ± 10 %
of the nominal volume flow rate
– Minimum differential pressure: 0.12 in. w.g.
– Maximum acceptable differential pressure:
1.2 in. w.g.
Sizing data
– _______________________________ [cfm]
– Δp
g
___________________________[in. w.g.]
– L
DNC
air-regenerated noise __________ [L
DNC
]
Standard text
This specification text
describes the general
properties of the product.
Texts for variants
can be provided by
contacting TROX USA.
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