The chamber is made of electropolished
stainless steel with inner dimensions 2,6 x 2.2 x 2.35 meters (breadth x
length x height). The volume of the chamber is 13.442 m3. It was
also checked by measurement with a tracer gas (N2O) with a result
of 13.468 m3. The effective internal surface is 30.64 m2
due to additional “floor” and “ceiling” made of steel sheets with holes. The
surface to volume ratio S/V = 2.28 m-1. The chamber is equipped
with several inlets/outlets for introduction of reactants and for connection
of sampling devices. A small circulation fan for internal mixing is placed
at the floor of the chamber. A large circulation fan for flushing of the
whole chamber is placed in a separate space. This chamber is suitable to be
operated at static mode, with room temperature and atmospheric pressure.
Relative humidity is not controllable.
The FLEC (Field and Laboratory Emission Cell) chamber has
been developed in a joint project between SP Technical Research Institute of Sweden, Danish National Institute of Occupational Health and
Danish Building Research Institute. It is today commercially available from
CHEMATEC; for details see
FLEC is currently used for measurements of emissions of
various compounds from flat surfaces (flooring materials, building material,
flooring constructions) as well as from small objects. The internal volume
is 0.000035 m3 (35 ml) and the sample area is 0.0177 m2.
The cell is operated according to various standards at a flow of 100 or 300
ml/minute, at a temperature of 23 ± 2 oC and relative humidity of
50 ± 5 % and atmospheric pressure. Cleaned and dried air is circulated above
the surface and the emitted compounds are sampled. FLEC complies with ISO
Various sampling devices may be connected to the chamber,
e.g. adsorbent tubes for volatile organic compounds or cartridges for
sampling of aldehydes or organic acids. Results are emission factors in
units of µg/(m2*hour).
new use of the FLEC is studies of processes on surfaces such as chemical
reactions, exposure and adsorption/desorption processes. A reacting gas or
exposing gas is introduced in the circulating air and the emitting compounds
are sampled and analyzed by suitable techniques.