Portable Blower cum Exhauster — Manufacturer & Supplier, India
Vayuvents manufactures Portable Blower cum Exhauster units for duct-connected fresh air supply and exhaust in confined spaces, tunnels, and deep industrial vessels. 300 mm to 750 mm dia. IS 3588. Mumbai. Call +91 90961 88703.
A Portable Blower cum Exhauster is a higher-pressure portable fan — typically with a centrifugal or high-static-pressure axial impeller — that can overcome the resistance of connected flexible ducting. This allows ventilation air to be delivered to confined space points 10 to 30 metres from the fan position, where it is not practical to place the fan directly at the entry point.
This distinguishes the blower cum exhauster from a simple portable ventilation fan — the portable fan can only deliver free-air without ductwork, while the blower cum exhauster can push or pull air through a flexible duct to reach deep inside a tank, far into a tunnel, or down a deep shaft where the fan itself cannot fit.
Applications include ship double-bottom tank ventilation via flexible duct inserted through the manhole, tunnel excavation face ventilation with duct running from the tunnel portal, and deep vessel internal cleaning ventilation where the fan remains outside the vessel and only the duct enters.
Vayuvents manufactures portable blower cum exhausters from 300 mm to 750 mm diameter with higher static pressure fan impellers matched to the expected duct resistance. Both supply (blower) and exhaust (exhauster) configurations from the same unit.
Key Features & Benefits
Duct-Connected Operation
Higher static pressure overcomes flexible duct resistance — delivers or exhausts ventilation air 10 to 30 metres from the fan through standard flexible ducting.
Supply and Exhaust Modes
Same unit functions as blower (pushes fresh air in) or exhauster (pulls contaminated air out) — switch between modes to suit the confined space entry sequence.
Deep Space Ventilation
Fan stays outside the confined space while only the flexible duct enters — reduces confined space entry risk for the fan operator.
Higher Static Pressure
Impeller selected for higher static pressure than standard portable fans — specifically to overcome flexible duct friction without excessive airflow loss.
IP55 All-Weather
IP55 TEFC motor for industrial site and outdoor confined space service in rain, dust, and humid conditions.
Multiple Duct Sizes
Supplied with adaptor to connect standard flexible duct sizes — 200 mm, 300 mm, 400 mm flexible duct connections available.
Reversible Motor Option
Single unit converts between supply and exhaust service by motor direction reversal — reduces equipment cost for operations requiring both modes.
IS 3588 Compliant
Fan performance tested per IS 3588-1987 at the required operating point including estimated duct resistance for typical 10 to 20 metre duct runs.
Technical Specifications
| Parameter | Specification |
|---|---|
| Fan Diameter | 300 mm to 750 mm |
| Airflow (Free Air) | 3,500 to 20,000 m³/hr |
| Static Pressure | Up to 30 mmWG at fan — sufficient for 15-20 m flexible duct |
| Motor Power | 0.25 HP to 1.5 HP |
| Motor Enclosure | IP55 TEFC |
| Duct Connection | 200 mm to 400 mm flexible duct adaptor |
| Cable Length | 3 to 5 metres |
| Power Supply | 415V 3-Phase / 230V Single-Phase |
| Standards | IS 3588-1987 | IS 4894 |
Airflow Performance — Model Range
| Sr. | Fan Model | Fan Dia (mm) | Motor (HP/Pole) | RPM | Free Air (m³/hr) | @5 mmWG | @10 mmWG | @15 mmWG | @20 mmWG | @25 mmWG |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | AX-75-28-120 | 305 | 0.75/2P | 2800 | 2,300 | — | 2,000 | 1,750 | 1,400 | — |
| 2 | AX-25-14-120 | 305 | 0.25/4P | 1440 | 1,800 | — | 1,500 | 1,450 | 1,320 | — |
| 3 | AX-50-14-150 | 385 | 0.50/4P | 1440 | 2,250 | 1,950 | 1,200 | — | — | — |
| 4 | AX-75-28-15 | 385 | 0.75/2P | 2850 | 5,000 | — | 4,100 | 3,900 | 3,700 | 3,300 |
| 5 | AX-50-14-180 | 460 | 0.50/4P | 1440 | 6,750 | 6,000 | 5,500 | 4,400 | — | — |
| 6 | AX-100-28-180 | 460 | 1.0/2P | 2880 | 9,000 | 8,000 | 7,500 | 6,200 | — | — |
| 7 | AX-100-14-240 | 600 | 1.0/4P | 1440 | 11,500 | 11,200 | 11,000 | 10,900 | 10,800 | — |
- Fan selection based on air at 20°C, density 1.2 kg/m³.
- Fan performance and tolerance as per IS 3588-1987.
Product Images
Where It Is Used
- Ship double-bottom and ballast tank ventilation through flexible duct via manhole
- Tunnel excavation face ventilation — duct runs from portal to working face
- Manhole and sewer entry ventilation — duct inserted vertically through manhole cover
- Boiler drum internal ventilation — duct inserted through inspection door
- Underground storage tank internal cleaning ventilation
- Deep foundation excavation air supply — duct from surface to working depth
- Column and vessel internal ventilation for inspection and maintenance
- Ship cargo hold deep section ventilation during grain loading and unloading
- Mine development heading ventilation — auxiliary fan with flexible duct
- Reactor and pressure vessel internal inspection pre-entry ventilation
- Underground electrical cable vault ventilation during maintenance
- Underground service tunnel fresh air supply during maintenance
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View Details →FAQs — Portable Blower cum Exhauster
Portable ventilation fans are used for temporary ventilation where fixed fans cannot be installed — confined space pre-entry air supply, construction site enclosed space ventilation, ship tank and hold pre-entry cooling, maintenance shutdown temporary air supply, and emergency deployment when fixed ventilation fails. They are the essential tool for safe confined space entry compliance under IS 5916 and OISD standards.
For safe confined space entry pre-ventilation, a minimum of 20 air changes per hour of the confined space volume is recommended, using fresh outdoor air (not recirculated). For a typical 50 m³ ship tank, this requires 1,000 m³/hr minimum — achieved by a 300 mm portable fan. For larger spaces (excavations, large vessels), 400 to 600 mm fans providing 6,000 to 13,000 m³/hr are recommended. Vayuvents provides sizing guidance for your specific confined space.
Yes. Portable fans with reversible motors supply fresh air when running forward and exhaust contaminated air when running in reverse. This flexibility allows one fan to serve both pre-entry supply ventilation and post-entry exhaust during work operations. Even without a reversible motor, the fan can be repositioned at the confined space opening to push air in or pull air out depending on whether supply or exhaust is needed.
Standard Vayuvents portable ventilation fans are supplied with 415V 3-phase supply for larger sizes (above 0.5 HP). For construction sites and confined space work where only single-phase supply is available, 230V single-phase versions are supplied for sizes up to 0.5 HP. Portable generator supply at 230V single-phase is the most common power source for confined space and construction site applications.
Standard portable fans with IP55 induction motors are NOT safe in explosive atmospheres (Zone 1 or Zone 2). For confined spaces that may contain flammable vapours (fuel tanks, solvent storage), only flameproof Ex-d certified portable fans should be used. Vayuvents can supply flameproof portable ventilation fans for hazardous atmosphere confined space entry — please specify when requesting a quotation.
A portable ventilation fan is an open propeller or tube axial fan designed for free-air supply or exhaust ventilation. A portable blower cum exhauster has a centrifugal or higher-pressure axial fan that can overcome the resistance of connected flexible ducting — allowing air to be directed to a specific point 10 to 30 metres away through a duct. The blower cum exhauster is preferred where the ventilation point is not directly accessible to the fan, requiring ductwork.
Contact Vayuvents at enquiry@vayuvents.com or call +91 90961 88703. Share the confined space or area volume, required airflow in m³/hr, power supply available (3-phase or single-phase), and any hazardous atmosphere requirements. We will recommend the correct model and provide a commercial proposal within 24 hours.