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Fresh air overflow
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Catalog excerpts

Fresh air overflow - 1

fresh air valves & overflow units Fresh air valves / overflow units About Lindab Product overview / symbols Ceiling diffusers Ceiling diffusers - visible Plenum boxes Wall diffusers Displacement diffusers Constant- / variable flow dampers Fresh air valves/overflow units Cleanroom diffusers © 10.2011 Lindab Ventilation A/S. All forms of copying without written permission are forbidden. is Lindab AB’s registered trademark. Lindab’s products, systems and product group and product designations are protected by intellectual property rights (IPR).

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Fresh air overflow - 2

Fresh air valves / overflow units 1 2 3 Fresh air valves Product Overflow units Product Right to alterations reserved

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Fresh air overflow - 3

fresh air valves / overflow units Lindab fresh air valves Lindab overflow units Fresh air valves are usually used in residences where mechanical supply air is not available, but there is still a need to ensure an air-change in the room. Overflow units are usually used in connection with the transfer of air between rooms. The overflow unit is able to balance two rooms, in connection with the supply of air in one room and exhaust air in a connecting room. The fresh air valve usually functions with a mechanical exhaust unit, where the volume of the exhaust air is replaced through the fresh air...

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Fresh air overflow - 5

Rubber seal Sound insulation Insect netting External grille type 1 • Easy to clean • Fits wall thicknesses from 250 mm to 430 mm • Can be supplied with sound insulation inserts in two thicknesses • External casing in several colours and materials ULA is a circular fresh air valve with telescopic wall sleeve for installation in an external wall close to the roof. ULA has an integral damper that can be operated using a pull-cord. The special telescopic wall sleeve makes it possible to install the valve in the wall without screws. The two telescopic parts are screwed together through the wall....

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Technical data ULA with sound insulation Ø140/Ø50 wall thickness: 300 mm Weighted element-normalised level difference Dn,e,w = 49 dB, Δmax = 8.3 dB ULA with sound insulation Ø140/Ø80 wall thickness: 300 mm Weighted element-normalised level difference Dn,e,w = 46 dB, Δmax = 7.6 dB Dn,e (dB) Sound reduction ULA without sound insulation wall thickness: 300 mm Weighted element-normalised level difference Dn,e,w = 38 dB, Δmax = 10.2 dB We reserve the right to make changes without prior notice

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Fresh air overflow - 7

Technical data The drawing above shows a trial set-up for determination of speeds in the occupied zone for different volumes of air and temperature differences. For trials with Δt = -40 K, a window with U = 1.5 W/m2 was used. At -20 K was U = 2.6 W/m2. We reserve the right to make changes without prior notice

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Fresh air overflow - 8

Description ULV is a rectangular fresh air valve for installation in external walls behind radiators. The valve is equipped with a damper that is opened and closed by means of a handle on the top. In order to achieve a good seal against the wall, the back of the valve is equipped with a sealing strip made of synthetic foam rubber. Three telescopic wall sleeve are available as accessories to the valves, including the sound-attenuated version. The valve can also be supplied with an extended damper arm. ULV is used for the intake of fresh air in connection with a mechanical exhaust system,...

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Fresh air overflow - 9

li ndab | Fresh ai r valves / overfl ow un its Accessories 1) Telescopic wall sleeve Width 230 mm. Weight 2.0 kg 35 The accompanying installation rail should be fastened to the wall. The fresh air valve is suspended from the rail and fastened to it by means of screws through the lower edge of the front plate. 3) Sound-attenuated telescopic wall sleeve Weight: 4.7 kg 2) Telescopic wall sleeve Width 470 mm. Weight 3.8 kg Width of wall sleeve: 230 mm corresponds to one brick 470 mm corresponds to two bricks We reserve the right to make changes without prior notice

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Fresh air overflow - 10

Technical data 1. ULV with wall sleeve type 1. 2. ULV with wall sleeve types 2 and 3. Sound reduction ULV with wall sleeve type 3 Weighted element-normalised level difference Dn,e,w = 48 dB, Δmax = 8.6 dB 80 The sound insulation measurements were undertaken by DELTA & Vibration, in accordance with the testing instructions in DS/ISO 140-3:1978 We reserve the right to make changes without prior notice

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lindab | Fresh air valves / overflow units Pressure control valve Description OLC is a circular pressure control valve for installation directly onto a wall. OLC consists of two sound-attenuating baffles, which are mounted either side of the wall and are connected by means of the accompanying perforated wall sleeve, which ensures excellent noise reduction. • Discrete design • Sound-attenuating baffles • Can be installed in wall thicknesses from 90-170 mm Maintenance Front plate can be removed to enable cleaning of internal parts. The visible parts of the diffuser can be wiped with a damp...

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Fresh air overflow - 12

Pressure control valve Technical data Technical data Sample calculation When dimensioning an overflow diffuser, calculate the decrease in the wall’s noise-reducing properties. For these calculations, the area of the wall and sound reduction figure R must be known. This is adjusted in relation to the diffuser’s Dn,e value. Dn,e is the diffuser’s R value given at a transmission area of 10 m2, as specified in ISO 140-10. The Dn,e value can be converted into the R value for other transmission areas using the table below. Volume flow qv [l/s] and [m3/h], total pressure drop Δpt [Pa] and sound...

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Fresh air overflow - 13

lindab | Fresh air valves / overflow units Pressure control valve 5 Description OLR is a rectangular pressure control valve for installation directly onto a wall. OLR consists of two sound-attenuating baffles, which are mounted either side of the wall and connected by means of the accompanying perforated wall sleeve, which ensures excellent noise reduction. • High capacity • Sound-attenuating baffles • Can be installed in wall thicknesses from 90-170 mm Maintenance Front plate can be removed to enable cleaning of internal parts. The visible parts of the diffuser can be wiped with a damp...

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