Sentinel D-Box Single Fan
Duct size 100 to 500mm
Performance - Airflow 0.01 to 1.6m3/s; Pressure up to 650Pa
Latest low energy EC/DC motors with Backward curved impellers
Sentinel demand ventilation fan controller with lockable isolator
Aluzinc contstruction suitable for Internal or External mounting
Performance tested to BS848 parts 1 & 2
Manufactured controlled to BS EN ISO 9001
The Sentinel single in-line duct fans are as supplied from Vent-Axia Ltd. Manufactured from Aluzinc, Sentinel fan units are internally treated with an ‘O’ class rated, BS476 part 6 & 7 acoustic foam which offers the benefits of high sound absorption, good thermal insulation properties, in addition to self extinguishing properties and resistance to ignition.
Weatherproof external units incorporate an additional controller shroud.
The casing includes an inclined inlet and bellmouth entry which directs the incoming air to the impeller with minimal turbulence. The result is better air management through the unit, less noise, higher efficiency and an increased performance.
The housing is designed to be as compact as possible for concealed false ceiling applications and Sentinel casings are specially designed to allow the unit to be mounted via its unique mounting bracket, ensuring a quick and easy solution to installation.
Impellers
All Sentinel units feature a low energy, Class 1, EC/DC external rotor motor and backward curved impeller assembly specifically chosen for performance and non-overloading characteristics. The assembly is dynamically balanced to DIN ISO 1940 Grade 6.3, duct size 500mm rated IP54, all other sizes IP44 according to BS EN 60529. Ball bearings are greased for life. Insulation is Class ‘B’ (from -25°C to +60°C). All models incorporate internal electronic overload protection and soft start function.
Electrical
Every Sentinel unit is fitted with a purpose designed common PCB controller incorporating a 16-character backlit alphanumerical x 2 line display with 4 button membrane keypad for fan status and commissioning set up. The enclosure is fitted with a 4-pole 10A isolator that is suitable for fitting a locking device to prevent accidental operation.
Motors are single phase 230V +/- 10% / 50/60Hz / 1ph (size 100- 400mm) or 400V +/- 10% / 50/60Hz / 3ph (size 500mm), (4 wire systems only).
24V DC power is provided from the controller for powering the matched range of Sentinel switches and sensors.
Performance/Sound
Extensively tested to BS848 parts 1 & 2. Published dB(A) figures are free field sound pressure levels at 3m with spherical propagation at reference level of 2 x 10-5 Pa. The inlet/outlet sound power level spectra figures are dB with a reference of 10–12 Watts.
Weatherproof Typical Ordering Designation
Ordering codes are similar to existing units with Suffix…. /WP which denotes Weatherproof.
Example: SENT100S/CP/WP
Accessories
For duct accessories see Ducting and Fitting Section.
Click here for technical information, within our Online Product Selector. After, select your required fan model from the list to display Performance, Sound, Dimensions and Electrical Data.
DIMENSIONS:
Hierarchy Model | Constant Pressure Model | a | b | c | d | e | f | g | h | Weight Kg |
100S | 100S/CP | 380 | 443 | 100 | 275 | 400 | 192 | 306 | 62 | 8.5 |
125S | 125S/CP | 380 | 443 | 125 | 275 | 400 | 192 | 306 | 62 | 8.5 |
150S | 150S/CP | 380 | 443 | 150 | 275 | 400 | 192 | 306 | 62 | 8.5 |
200S | 200S/CP | 435 | 531 | 200 | 330 | 453 | 287 | 360 | 60 | 12.5 |
250S | 250S/CP | 435 | 531 | 250 | 330 | 453 | 287 | 360 | 35 | 13 |
315S | 315S/CP | 710 | 808 | 315 | 540 | 661 | 458 | 568 | 43 | 34 |
400S | 400S/CP | 710 | 808 | 400 | 540 | 661 | 458 | 568 | 43 | 36 |
500S | 500S/CP | 898 | 996 | 500 | 735 | 858 | 577 | 765 | 59 | 55 |




A wall or ceiling person presence detector for use with Sentinel. Can be used in MIN - MAX mode or for direct damper control. Fits any UK single gang mounting box. Adjustable timer overrun (5-25 minutes). Range of detection up to 10 metres. Designed to meet IP43. Ambient operating temperature range 0°C to +50°C. Supply voltage 24V DC SELV.









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ESTIMATED RUNNING COSTS
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Overview
The Sentinel single in-line duct fans are as supplied from Vent-Axia Ltd. Manufactured from Aluzinc, Sentinel fan units are internally treated with an ‘O’ class rated, BS476 part 6 & 7 acoustic foam which offers the benefits of high sound absorption, good thermal insulation properties, in addition to self extinguishing properties and resistance to ignition.
Weatherproof external units incorporate an additional controller shroud.
The casing includes an inclined inlet and bellmouth entry which directs the incoming air to the impeller with minimal turbulence. The result is better air management through the unit, less noise, higher efficiency and an increased performance.
The housing is designed to be as compact as possible for concealed false ceiling applications and Sentinel casings are specially designed to allow the unit to be mounted via its unique mounting bracket, ensuring a quick and easy solution to installation.
Impellers
All Sentinel units feature a low energy, Class 1, EC/DC external rotor motor and backward curved impeller assembly specifically chosen for performance and non-overloading characteristics. The assembly is dynamically balanced to DIN ISO 1940 Grade 6.3, duct size 500mm rated IP54, all other sizes IP44 according to BS EN 60529. Ball bearings are greased for life. Insulation is Class ‘B’ (from -25°C to +60°C). All models incorporate internal electronic overload protection and soft start function.
Electrical
Every Sentinel unit is fitted with a purpose designed common PCB controller incorporating a 16-character backlit alphanumerical x 2 line display with 4 button membrane keypad for fan status and commissioning set up. The enclosure is fitted with a 4-pole 10A isolator that is suitable for fitting a locking device to prevent accidental operation.
Motors are single phase 230V +/- 10% / 50/60Hz / 1ph (size 100- 400mm) or 400V +/- 10% / 50/60Hz / 3ph (size 500mm), (4 wire systems only).
24V DC power is provided from the controller for powering the matched range of Sentinel switches and sensors.
Performance/Sound
Extensively tested to BS848 parts 1 & 2. Published dB(A) figures are free field sound pressure levels at 3m with spherical propagation at reference level of 2 x 10-5 Pa. The inlet/outlet sound power level spectra figures are dB with a reference of 10–12 Watts.
Weatherproof Typical Ordering Designation
Ordering codes are similar to existing units with Suffix…. /WP which denotes Weatherproof.
Example: SENT100S/CP/WP
Accessories
For duct accessories see Ducting and Fitting Section.
Technical
Click here for technical information, within our Online Product Selector. After, select your required fan model from the list to display Performance, Sound, Dimensions and Electrical Data.
DIMENSIONS:
Hierarchy Model | Constant Pressure Model | a | b | c | d | e | f | g | h | Weight Kg |
100S | 100S/CP | 380 | 443 | 100 | 275 | 400 | 192 | 306 | 62 | 8.5 |
125S | 125S/CP | 380 | 443 | 125 | 275 | 400 | 192 | 306 | 62 | 8.5 |
150S | 150S/CP | 380 | 443 | 150 | 275 | 400 | 192 | 306 | 62 | 8.5 |
200S | 200S/CP | 435 | 531 | 200 | 330 | 453 | 287 | 360 | 60 | 12.5 |
250S | 250S/CP | 435 | 531 | 250 | 330 | 453 | 287 | 360 | 35 | 13 |
315S | 315S/CP | 710 | 808 | 315 | 540 | 661 | 458 | 568 | 43 | 34 |
400S | 400S/CP | 710 | 808 | 400 | 540 | 661 | 458 | 568 | 43 | 36 |
500S | 500S/CP | 898 | 996 | 500 | 735 | 858 | 577 | 765 | 59 | 55 |
Accessories




A wall or ceiling person presence detector for use with Sentinel. Can be used in MIN - MAX mode or for direct damper control. Fits any UK single gang mounting box. Adjustable timer overrun (5-25 minutes). Range of detection up to 10 metres. Designed to meet IP43. Ambient operating temperature range 0°C to +50°C. Supply voltage 24V DC SELV.









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