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OPTI-C – Roof exhaust

The Optimum roof exhaust is designed for sloped roofs of 2/12 and more. Its design prevents the interior hatch from freezing allowing optimal air evacuation all year. The interior must be insulated to prevent any risk of condensation. This valve picks up stale air from appliances heading outwards such as dryers, bathroom fans or stove hoods. The mesh is made from the same galvanized steel and the structure blocks the intrusion of birds or rodents inwards with minimal maitenance. The front deflector prevents the infiltration of inclement weather that could clog the inner hatch.

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  • Designed to avoid infiltration
  • Available in ø 4", ø 6", ø 8", ø 10" and 3¼” x 10"





The Optimum roof exhaust prevents ice formation. It eliminates the possibility of cold air entering into the interior of the house. In addition, the side air unit pushes air upwards rather than directly to the roof. The exit must be 14 cm (5 1/2 inches) higher from the roof to prevent it from obstructing even if there is some snow accumulation. The stale air drain is ideal on the roof. With an exit placed in the soffit the stale air will largely end up in the roof risking condensation and damage to the roof structure or insulation. Even when an Optimum vent is used, this excess hot air and/or moisture can lead to a decrease in efficiency of the vent and cause problems.



OPTI-C4 13 cm • 5,1” 19,7 cm • 7,8” 33 cm • 13” 38 cm • 15” Galvanized steel pipe of 4″ ø
OPTI-C6 18,1 cm • 7,1” 19,7 cm • 7,8” 38 cm • 15” 38,4 cm • 15,1” Galvanized steel pipe of 6″ ø
OPTI-C8 23,9 cm • 9,4” 25,9 cm • 10,2” 44cm • 17,3” 44,5 cm • 17,5” Galvanized steel pipe of 8″ ø
OPTI-C10 29,7 cm • 11,7” 32,4 cm • 12,8” 49,9 cm • 19,7” 50,5 cm • 19,9” Galvanized steel pipe of 10″ ø
OPTI-C10REC 28,3 cm • 11,1” 19,7 cm • 7,8” 48,3 cm • 19” 38,4 cm • 15,1” Galvanized steel pipe of 3 ¼” x 10″


The vent is manufactured from galvanized steel followed by a specialized baked paint finish.


Standard colours available: brown, grey and black. Other colours available on special order (additional fee).


In compliance with CSA

The National Building Code requires adequate ventilation of the roof as per the minimum standard of Section 9.19.1 or according to the ACNOR CAN3-A93-M82.


Optimum vents have a limited lifetime warranty against any manufacturing defects that may affect the unit. We can offer this peace of mind to all our customers because all our products are CSA approved. We apply also those same criterias of quality on all custom models. This means that during the time when the owner of the house who installed or had installed the Optimum vent remains at the address of the installation, Ventilation Optimum replace it free for the first five years and thereafter, in proportion to the years of use, against any defect. In such a case, the cost of transportation and installation will be at the customer charge as well as any home repairs. The warranty applies in all cases where the Optimum vent has been installed according to our recommendations and has been free from any abuse, misuse or other circumstances beyond the control of Ventilation Optimum including salty air.
Warranty regarding painting:
The Optimum Roof Ventilator is made of 24 and 26 gauge galvanized steel and is coated with a powder or liquid baked polyester based paint. Optimum Ventilation is proud to offer you a 5 year warranty against corrosion. During this period, Ventilation Optimum will replace the product at the counter upon presentation of the original proof of purchase.
The responsibility of Ventilation Optimum is limited only to the replacement of parts in the workshop. All expenses related to time, travel and home repairs are not covered by this warranty.
Corrosion that does not result from a defect in material or workmanship is not covered by this warranty. Circumstances beyond the control of Ventilation Optimum such as: corrosion caused by industrial fallout, acid rain, accidents, damage, negligence, modification of the product as well as that resulting from improper installation damaging steel, paint scratched by handling, installation or negligence, by an acid environment such as swine farms etc … are excluded from this warranty.
This warranty also excludes damage caused by:
– Infiltration of water due to an improper installation that does not comply with the recommendations and instructions of the manufacturer,
– The infiltration of water and / or condensation due to a building deficiency at the level of the national building code.
– Failure of roof drainage.
– The accumulation of snow covering the vent
– Any domestic paint applications or inappropriate cleaning solutions.
– Bad weather and natural disasters
– Transportation, handling or storage
Tightness of the roof or parts installed by the contractor are not guaranteed as they are out of the control of the manufacturer. It is the roofer’s responsibility to ensure that the base is properly waterproofed using the proper roofing products. The Association of Master Roofers (AMCQ) recommends using the following technique: Metal flanges: The metal flanges of all projections must be coated with a primer embedded in plastic roofing cement, covered with a fold of cotton saturated with asphalt or canvas, followed by a fold of 15-pound felt and another fold of cotton saturated with asphalt or canvas embedded in a bitumen. In addition, having no precise notion of the composition of the building such as the tightness of the vapor barrier, the insulation or the exact amount of air inlets; these elements do not allow us to give a guarantee on the final result. Proof of purchase showing the date, your name and the shipping address will be essential in order to make any warranty claim.