Centrifugal in-line fan 250 mm InLineVent
RR, RRK and SilentBox
Accessories for RRand RRKPipe clamp connectors RR 250 A
FrequencyHzTotal1252505001k2k4k8k L WA Case breakoutdB(A)5535424550484633 L WA IntakedB(A)7262676767646247 BM 250 Ref. No. 5079A quick-fix method for connecting
fans to ducting, reducing vibrationtransmission. When installing leavea little gap between fan and ducting. Supplied in pairs. RR 250 CRRK 250SB 250 C
FrequencyHzTotal1252505001k2k4k8k L WA Case breakoutdB(A)6240425258585250 L WA IntakedB(A)7352666768656460 FrequencyHzTotal1252505001k2k4k8k L WA Case breakoutdB(A)6046495256555141 L WA IntakedB(A)6853566461605747 Mounting feet for RR
FrequencyHzTotal1252505001k2k4k8k MK 4 Ref. No. 5824
L WA Case breakoutdB(A)4434354038342922 Mounting feet for RRK
L WA IntakedB(A)5952565143393929 MK 2 Ref. No. 5822To fix fan on wall, floor or ceiling;
made from galvanised steel.
∆ p stat. L WA ExhaustdB(A)7159636266656152 Pa ρ = 1.20 kg/m 3 Accessories for all modelsBackdraught
shutter RR 250 C
RRK 250 RSK 250 Ref. No. 5673Air stream operated, metal. Gravity shutter VK 250 Ref. No. 0759Air stream operated, polymer, light-grey. SB 250 C Rain repellent grille RAG 250 Ref. No. 0751From polymer, light-grey.
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RR250 A Guard for spigot connection SGR 250 Ref. No. 5067For intake and exhaust installationon fan, made from galvanisedsteel.
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Consider required minimum system resistance. V.m 3 /h
cm/s Sound levels Flexible attenuator Total sound power levels and the spectrum figuresin dB(A) are given for case breakout
intake and exhaustin the tables above the performance curves.In addition the case breakout figure is given as a sound pressure level at 1 metre (freefield conditions) in the technical data table (see facing page).Note: For silentbox the sound level on intake is lower than onexhaust.
InformationPages Technical description148
Selection chart149Design of systems12-16Modular comp. system150 FSD 250 Ref. No. 0680
Spigotted aluminium attenuatorwith 50 mm insulation. Length: 1 m. Spigotted attenuators SRSD 250/... see page 219
Spigotted attenuator with 50 mminsulation. Available in four lengths:300/600/900/1200 mm. In-line air filter box LFBR 250 Ref. No. 8580Air filter with big cross sectional
area to be installed in-line with
ducting. Spigots incorporate twin-seal rubber sealings to fitstandard size ducting. Electric
heater battery EHR-R 6/250 Ref. No. 8712In duct casing made from galvanised sheet steel, for in-line installation. Water heater battery LPHW
Other accessoriesPages WHR 250 Ref. No. 9483Compact unit for in-line installation. Information for ducting systems All Helios components fit standard nominal duct diameters. The ducting usedmay be rigid, flexible made
from aluminium, galvanised
steel or plastic.
Observe fire protection
regulations where applicable.
Filters and heater batteries211-220
Flexible ducting, guards, duct componentsand roof outlets245-256
Valves257-263
Speed controllers and switches275-290 Transformer speed controller TSW 1.5 Ref. No. 1495 Electronic speed controller for RR and RRK ESA1 Ref. No. 0238 for SB ESA3 Ref. No. 0239 161