355 mm and 400 mm InLineVent
SilentBox
AccessoriesBackdraught
shutter SB 355 C
FrequencyHzTotal1252505001k2k4k8k L WA Case breakoutdB(A)4637384239343327 L WA IntakedB(A)6761615755585448 RSK 355 Ref. No. 5650
L WA ExhaustdB(A)7664636569736860 RSK 400 Ref. No. 5651Air stream operated, metal. SB 400 F
FrequencyHzTotal1252505001k2k4k8k L WA Case breakoutdB(A)5144444146383925 Gravity shutter
L WA IntakedB(A)6259585149464435 VK 355 Ref. No. 0761
L WA ExhaustdB(A)7760677273686555 VK 400 Ref. No. 0762Air stream operated, polymer, light-grey. Rain repellent grille RAG 355 Ref. No. 0753
∆ p stat. 3 RAG 400 Ref. No. 0754To cover intake or extract openings
in walls, polymer, light-grey.
Pa
V.m ρ = 1.20 kg/m Flexible attenuator FSD 355 Ref. No. 0682 SB 400 F FSD 400 Ref. No. 0683
Spigotted aluminium attenuatorwith 50 mm insulation. Length: 1 m. SB 355 C Spigotted attenuators SRSD 400/... see page 219
cm/s Spigotted attenuator with 50 mminsulation. Available in four lengths:300/600/900/1200 mm. **
In-line air filter box LFBR 355 Ref. No. 8583 LFBR 400 Ref. No. 8582Air filter with big cross sectionalarea to be installed in-line withducting. Spigots incorporate twin-seal rubber sealings to fit
standard size ducting.
*
Consider required minimum system resistance. 3 /h Electric
heater battery Sound levels 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 EHR-R 9/355 Ref. No. 8656 EHR-R 9/400 Ref. No. 8657In duct casing made from galvanised sheet steel, for in-line installation. Water heater battery LPHW WHR 355 Ref. No. 8790 WHR 400 Ref. No. 9524Compact unit for in-line installation. Transformer speed controller Compact controller for low noise
5 speed operation. for SB 355 C TSW 3.0 Ref. No. 1496 for SB 400 F TSW 5.0 Ref. No. 1497 Full motor protection unit for SB 400 F MW Ref. No. 1579
Other accessoriesPages Flexible ducting Information for ducting systems All Helios components fit standard nominal duct diameters. The ducting usedmay be rigid or flexible and 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 ALF 355 Ref. No. 5758 ALF 400 Ref. No. 5759Two flexible layers of aluminium foil with incorporated steel helix
support. Forming almost any bend. A carton of 60 cm length incorporates 10 m of ducting. 165