CFM Recommendations
Ventilation performance is measured in Cubic Feet per Minute, or CFM. The higher the CFM, the greater the amount of air that is evacuated through the ventilation system. CFM recommendations are based on the cooking appliance output.

XO recommends 1 CFM per 100 Btu/hr.

Some Typical Examples:

Bertazzoni 36′ 6 Burner Range (49,000 Btu) = 490 CFM Requirement
AGA Pro+ Dual Fuel 36′ 5 Burner (50.400 BTU) = 504 CFM Requirement
GE Caf̩ 30′ 5 Burner Range (55,100 BTU) = 550 CFM Requirement
Viking 30′ 4 Burner Range (60,000 BTU) = 600 CFM Requirement

Internal vs Remote Blower
A ventilation system must include a blower assembly.
All XO ventilation models come with the blower installed for quick and easy installation. This saves time and money.

Remote blowers are mounted on the roof. This requires extra cost and maintenance. Remote mounted blowers will minimize the amount of blower noise, but will not eliminate the noise completely.

Recirculating Ventilation
All XO models can function both as filter or exhaust hoods: exhaust hoods take the air and expel it to the outside of the house, while ductless filter hoods use grease and charcoal odor filters to purify the air and then return it to the original environment. IMPORTANT NOTE: This type of ventilation will not remove heat, moisture or combustion gases
from the air. It will also be less effective in reducing odors and smoke.

Width Guidelines
The minimum hood width recommended for wall installations should be equal to the width of the cooktop or range. If the space is not restricted, a wider hood should be used to increase the capture area. Island installations require a greater capture area.
It is recommended that XO island hoods overlap the width of the cooktop or range by a minimum of 3″ on either side.

Ceiling Height
When selecting an XO ventilation hood, make sure there is enough ceiling height to accommodate the hood. This can be determined by adding the floor-to-countertop height plus the recommended spacing between the countertop and the bottom of the hood plus the height of the hood. All XO hoods are designed to work with ceiling height from 7.5 ft to 9 ft.
For applications up to 10ft tall an optional duct cover extension is available.

Electrical Requirements
XO hoods require a separate, grounded 120 V AC, 60 Hz power supply. The service should have its own 15 amp circuit breaker. Placement of the electrical supply is not critical as long as you provide a minimum of 12″ (305) of 120 V AC power cable for the wall hood and 6′ (1.8 m) for the island hood.

Ducting Considerations
Most XO hoods require an 6′ Round or a 3 _’ x 10′ duct pipe.
Smaller duct sizes will significantly reduce ventilation performance.

IMPORTANT NOTE: Use only metal ductwork.. Ducting can run through the roof, external wall or eave . A straight, short duct run with a limited number of elbows and transitions will allow the ventilation hood to perform most efficiently.
XO ventilation hoods will operate most efficiently when ductwork does not exceed 50′ in length.
Consult your local HVAC professional for specific requirements in your area.

Minimize duct runs and number of elbows and transitions. Do not place elbows and transitions back-to back.