The Sentinel single in-line duct fans are as supplied from Vent-Axia Ltd. Manufactured from prime quality galvanised sheet steel, 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 resistant to ignition.

Weatherproof external units incorporate controller shrouds and are coated externally with a polyurethane finish.

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.

All Sentinel units feature a low energy, Class 1, EC/DC external rotor motor and backward curved impeller assembly specifically chosen for performance and nonoverloading characteristics. The assembly is dynamically balanced to DIN ISO 1940 Grade 6.3, motor 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.

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.

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.

Ordering Codes are similar to existing units with Suffix.... /WP which denotes Weatherproof finish.

Example: SENT100S/CP/WP

Hierarchy Model	Constant Pressure Model	Dimensions in mm(*)								Weight Kg
		a	b	c	d	e	f	g	h
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