Air Powered Confined Space Fans And Blowers

Can a blower be placed vertically above a manhole?

Yes, confined space blowers can be placed above a manhole if it is supported safely, with proper ingress / egress, movement, vibration and weight mitigation.

What makes confined space fans unique?

• Motors which are built to last: These motors are designed to operate in the harshest of environments. Some fan models have totally enclosed motors that can minimise the possibility of debris build-up, thereby maximising life expectancy.
• Dual wall design - Large dents can not only produce rust spots, they can obstruct fan blade revolution as well, leading to costly repairs. Hence, dual wall shells and aluminium / polyethylene construction help prevent disturbances in airflow or internal mechanisms.
• Safety - These confined space ventilation fans are made in compliance with OSHA, ANSI / API, UL & cUL, and AMCA 210 industry standards to ensure safety and superior performance.

Is it better to positively ventilate or to evacuate air?

Any confined space must be positively ventilated, and should be evacuated when smoke is being generated in a specific location (for example, during grinding or welding operations).

What is the main difference between axial and centrifugal blowers?

Axial blowers feature internally housed motors that make them more portable & compact, as well as less expensive than centrifugal models. They offer higher airflow ratings in free air configuration than centrifugal blowers. Centrifugal variants, on the other hand, have the motor located outside the housing. The design of these blowers permits them to push against higher static pressure (greater dynamic back-pressure) with enlarged lengths of ducting, as compared to axial blowers.

Where should ventilation be directed in a confined space?

The ventilation equipment should be directed to the nearest entrance within the restricted space, to exhaust fumes and smoke.

What should the minimum oxygen level be in a confined space?

The minimum acceptable oxygen level in a confined space can be 15 to 19%, but that usually results in decreased ability to work and impaired coordination, thereby risking the health of workers. Hence, a confined space fan and blower play a vital role in creating a safe & hazard proof working environment for anyone who works in a small & enclosed area.