Frequently Asked Questions

The main difference between a 4-blade and 5-blade fan is aesthetics, with some additional wind noise associated with 5-blade fans. For a given motor, a 4-blade fan will move more air than a 5-blade fan. The 5th blade puts additional drag on the motor, slowing down the RPM of the blades, which decreases the CFM. All Electrowave fans, whether 4 or 5 blades, are designed for optimal air delivery
You need to choose the right size fan for a room to get optimum comfort and energy savings. If the fan is too small for the room, it will not move enough air to make you feel comfortable. If the fan is too big, it could move too much air. Electrowave recommends the following: For Rooms Up To: Fan Blade Span: 100 sq. ft. 30-48" 400 sq. ft. 50-54" 400 sq. ft. or larger 56"+
The Electrowave Original® has a very unique motor that uses an oil-bath lubrication system. This system keeps the main bearings lubricated at all times, for quiet operation and long-life. It is part of the reason why this fan has a limited lifetime motor warranty. Most other fans use motors that do not require oil.
Ceiling Fans Selection Guide- Ceiling Fans
Recommended Sweep for different room sizes:
  • Room Size Fan Sweep
  • 4m*5m to 4.5m*4.5m 1400
  • 3.3m*4m to 3.7m*3m 1200
  • 2.7m*2.7m to 3m*3m 1050
  • 2.4m*2.7m to 2.4m*2.4m 900
Important: - To optimize air-delivery, your fan should be approximately 3 meters from the ground and 0.3 meters from the roof. For larger rooms with more than one fan, the center distance between each fan will depend on the sweep of the fan.
• Usha’s Expert Opinion about Usha Exhaust Fans In order to calculate the ventilaion requirements of a room, one has to first assess how many air changes are ideally needed in it. The following chart illustrates standards as per the locations:
Air delivery (m3/hour)= Volume (m3) x Air changes per hour .
The recommended Air changes are as under:
  • Assembly halls 8-12
  • Banks 4-8
  • Boiler houses 40-60
  • Canteens/Restaurants 12-20
  • Cinemas/Theatre 20-30
  • Factories /Workshops 12-20
  • Foundries 40-60
  • Hospitals(General Ward) 8-12
  • Kitchens 20-30
  • Laboratories 8-12
  • Offices 8-12
  • Photographic Darkroom 20-30