ACOUSTIC CABINET FANS Centribox CVB-CVT Series, Forward Curved Centrifugal Fans

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1 Hacer título más resumido ACOUSTIC CABINET FANS Centribox CVB-CVT Series, Forward Curved Centrifugal Fans Construction Casing The fan casings are manufactured from heavy gauge galvanised sheet steel and internally lined with a dense non-flammable Melanex (M1 ) acoustic insulation. All models are supplied, as standard, with circular duct connection flanges on the discharge and inlet panels. However a variety of different connectors are available - see product accessories. The specific design of the product enables the casing side panels to be removed and the motor / impeller assembly accessed without having to remove the fan case from the ducting. Technical characteristics Description The Centribox CVB-CVT range of acoustic cased fans are specifically designed to provide ventilation solutions for noise sensitive environments. The range comprises of four nominal product sizes covering 17 models in total. All models incorporate direct-drive low pressure centrifugal fans. The CVB-CVT range is available in: Single phase, 2V 5Hz, with four (4) and six (6) pole speed motors. Three Phase, 2/4V 5Hz with six (6) pole speed motors Air volume performance ranges from 5 up to 6,5 m /hr. All models are supplied with four mounting feet and an industrial grade cable entry gland (located on discharge panel side) to facilitate installation and wiring. Fans All models incorporate double inlet directdrive low pressure centrifugal fans (with scroll) with galvanised steel forward curved impellers. All fan assemblies are fitted to the casing discharge panel using a rigid support frame with two anti-vibration mountings. Applications The Centribox CVB-CVT range are suitable for many general ventilation applications where the noise level of the ventilation system is of particular importance. Typical installations would include: Commercial offices. Restaurants and cafes. Libraries and public buildings etc. Motors All motors are factory matched and directly mounted to the scrolled fan casing using a rigid support frame. The complete motor, impeller and fan scroll assembly is then dynamically balanced to ISO194 stanards. The CVB-CVT motors incorporate the following standard specifications: Single Phase, 2V 5Hz, supplied with capacitor. Three Phase 2/4V 5Hz. Thermal Overload Protection (internal automatic operation for all single phase models). " Curve Speed Motor Protection Insulation Absorbed Absorbed current Max. Sound Weight nº power class current three phase air pressure absorbed single phase 5 Hz volume level* 5 Hz 2 V 2 V 4 V Model (r.p.m.) (CV) (A) (A) (A) (m /h) (db(a)) (kg) CVB-18/18 1/ /1 IP-44 B, CVB-24/18 1/ /6 IP-44 B 1, CVB-24/18 1/ 9 1/ IP-44 B 1, CVB-24/24 1/ /6 IP-44 B 1, CVB-24/24 1/ 5 9 1/ IP-44 B 1, CVB-27/2 1/ 6 9 1/ IP-44 F, CVB-27/2 1/ /2 IP-44 F 4, CVB-27/27 1/ 8 9 1/ IP-44 F, CVB-27/27 1/ /2 IP-44 F 4, CVB-2/24 /4 1 9 /4 IP-44 F 5, CVT-2/24 1, ,5 IP-44 F 7, 4, CVB-2/2 / /4 IP-44 F 5, CVT-2/2 1, ,5 IP-44 F 7, 4, POLE CVB-18/18 1/ /5 IP-44 F 1, CVB-24/24 1/ /2 IP-44 F, CVB-27/2 1/ /2 IP-44 F 4, CVB-27/27 / /4 IP-44 F 6, *Measured at discharge with maximum air volume ( at 1.5m). 6 POLE 14

2 Performance curves Q = Air volume in, m /hr and m /s Pe = Static pressure in mmwg and Pa. Dry air at 2 ºC and 76 mmhg. Air flow data in accordance with the following standards: UNE , BS 848, Part 1, AMCA and ASHRAE Pe Pa mmwg 6 6 CVB CVT ,,2,4,6,8 1, 1,2 1,4 1,6 1,8 2, 2,2 m/h Q m/s Please refer to technical characteristics table. Pe Pa mmwg 6 6 CVB CVT ,,2,4,6,8 1, 1,2 1,4 1,6 1,8 2, 2,2 m/h Q m/s Please refer to technical characteristics table. 141

3 Mounting accessories CBR Rectangular Duct Connectors These can be used instead of the circular spigots supplied as standard. Nominal connection flange (mm) CVB-18 CBR-25 x 25 CVB-24 CBR 5 x 5 CVB-27 CBR 4 x 4 CVB / T-2 CBR 45 x 45 CRC Circular Reducers Circular ducting connection reducers. To enable the connection of smaller diameter ducting. Nominal diameters of reducers available (mm) CVB-18 CRC 25/2 CVB-24 CRC 55/15 CRC 55/25 CVB-27 CRC 4/55 CRC 4/15 CRC 4/25 CVB / T-2 CRC 5/45 CRC 5/4 CRC 5/15 KAA-KAD Flexible Couplings Circular flexible connectors type KAA. Rectangular flexible connectors type KAD. Rectangular Circular Air supply+cbr Inlet Air supply Inlet+CAC CVB-18 KAD 25 x 25 KAD 25 x 25 KAA 25 KAA 25 CVB-24 KAD 5 x 5 KAD 4 x 4 KAA 55 KAA 55 CVB-27 KAD 4 x 4 KAD 45 x 45 KAA 4 KAA 4 CVB / T-2 KAD 45 x 45 KAD 5 x 5 KAA 5 KAA 5 KSE Anti-vibration Mounts (set of 4) Rubber anti-vibration mounts to reduce vibration transmission. KSE CVB-18 KSE 45 CVB-24 KSE 45 CVB-27 KSE 45 CVB / T-2 KSE 45 CSC Protective Cowls Protective cowls for external installations. Cowl CVB-18 CSC 18 CVB-24 CSC 24 CVB-27 CSC 27 CVB / T-2 CSC 2 142

4 Dimensions (mm) G C E J M8 A F M x N Ø D B H K 25 L A B C Ø D E F G J H K L M x N CVB x 25 CVB x 4 CVB x 45 CVB/T x 5 * Nominal ducting diameter. Mounting options KAA CRC Standard circular duct coupling CSC CAC KAA Standard circular duct CVB KAA KSE KSE KAD CBR CAC + CBR KAD CBR Rectangular duct connectors CRC Circular reducers KAA Flexible couplings KAD Flexible coupings KSE Anti-vibration mounts CSC Protective cowls CVB CVT: Centribox fans 14

5 Acoustic characteristics Sound power spectrum: To obtain the sound power spectrum, subtract the correction values (db(a)) shown in the table below at the corresponding octave average frequencies, from the value given in the Technical Characteristics table Inlet CVB/18/18 1/1 Disc Rad Inlet CVB/4-18/18 1/5 Disc Rad Inlet CVB-24/18 1/6 Disc Rad Inlet CVB-24/18 1/ Disc Rad Inlet CVB-24/24 1/6 Disc Rad Inlet CVB-24/24 1/ Disc Rad Inlet CVB/4-24/24 1/2 Disc Rad Inlet CVB-27/2 1/ Disc Rad Inlet CVB-27/2 1/2 Disc Rad Inlet CVB/4-27/2 1/2 Disc Rad Inlet CVB-27/27 1/ Disc Rad Inlet CVB-27/27 1/2 Disc Rad Inlet CVB/4-27/27 /4 Disc Rad Inlet CVB-2/24 /4 Disc Rad Inlet CVT-2/24 1,5 Disc Rad Inlet CVB-2/2 /4 Disc Rad Inlet CVT-2/2 1,5 Disc Rad Recommendations for installing the S&P acoustic case fan ranges Do Not alter the inlet position of the fan. Cover 144

6 Recommendations for installing the S&P acoustic case fan ranges When discharging to free air. Do Not install the fan discharge near walls or any objects that might prohibit the flow of air. Avoid any sudden reductions in ducting diameters. Where possible use a gradually tapered reduction. To eliminate any vibration to surrounding structures we would recommend, where possible; to fit S&P KSE anti-vibration mountings. 145