skip to Main Content

AF-10-C04-CMF | Aura Fan Curb Mount Flange 10″ Diameter 4″ Collar


  • Optional Fan Controls

    • 20 $
    • 60 $
    • 100 $
  • A Roof Curb to Elevate the Base of the unit is available, with or without insulation. 

    • 46 $
    • 65 $
  • All our aluminum products can be painted with a durable baked-on powder coating surface finish.

    • 0 $
    • 12 $
    • 24 $

    Hover (or tap once) to show color with name, Click (or tap again) to select.

    Hover (or tap once) to show color with name, Click (or tap again) to select.

SKU: AF-10-C04-CMF Category:

Shipping Policy

Before 2015, Carriers used a simple formula to determine the cost of shipping based on the weight of the package and the distance the package traveled. The heavier the package and the further it was transported, the higher the cost.

However, trucks are limited by the volume of packages they can transport. Large packages that are light weight were more of a limiting factor than simply the weight of the package. Therefore they instituted a “Dimensional Weight” which is often used as the “Billable Weight” to calculate the cost of shipping. Our aluminum products are strong, durable, and naturally weather resistant. They are also lightweight relative to their shipping volume, so nearly all of our shipping costs must be calculated on the dimensional weight.

We are experienced in finding the most cost-effective shipping options available, but it takes our skilled and resourceful office staff time to find the most cost-effective transport solutions. We have boxes that can fit mutiple products, we utilize pallets when appropriate, and have several freight companies which we have built relationships with over the years. This is why we don’t commit you to a shipping charge when you select your vents, but rather take the time to find the best manual price that we can before we send you a follow-up email with the shipping quote added to the price of the vents. We appreciate your patience.

UPS Billable Weight Calculation

Basic dimensions of the Aura Fan and it’s identifying attributes. Primary identifying dimensions of vents and fans are the inside diameter of the Head, which equals the diameter of the hole being vented, and the height of the Collar which is the solid tube between the Head of the vent and the Flange which attaches to the roof.

Inside Diameter:

8 in.
20.3 cm.

Outside Diameter:

14.5 in.
36.8 cm.

Square Flange (side length):

14 in.
35.6 cm.

Height of Head:

6 in.
15.2 cm.

Collar Height:

4 in.
10.2 cm.

Height of Flange:

2 in.
5.1 cm.

Total Height with Collar and Flange:

12 in.
30.5 cm.

Louvers are the vertical openings in the vent, which facilitates the flow of air, while keeping animals, insects, debris, and embers out.  The combination of inner and outer Louvers on our patented “Aura” series of vents and fans are shaped to create a positive vacuum effect which draws air out of the vent, utilizing a physical principle known as the Venturi effect.

Louver Height (inside):

4 in.
10.16 cm.

Louver Height (outside):

4 in.
10.16 cm.

Size of opening btwn blades (inside):

0.125 in.
0.3175 cm.

Size of opening btwn blades (outside):

0.25 in.
0.635 cm.

Expected snow and rain in your region and the pitch of the roof are the key consideration when choosing the height of the collar of your roof vents. Zones 1 and 2 are not expected to sustain significant snow packs, while zones 3-7 are likely to experience snow, possibly for weeks or months. Vent collars under 4 inches are inappropriate for flat (0/12 pitch) roofs because even heavy rain can splash water into a shorter vent.

Map of Climate Zones

Minimum Pitch Capacity:


Maximum Pitch Capacity (Standard Vent):


Maximum Pitch Capacity (Modified):


Free Air Space:

78.5 sq. in.

Free Air Space:

0.545 sq. in.

1:150 Ventilation Rule:

163.6 sq. in.

1:300 Ventilation Rule:

327.2 sq. in.

When the Fan is OFF, the Venturi effect is stimulated by even small breezes creates a positive movement of air out of the vent without the need of any part of the vent to move. This movement of air is proportional to the wind speed, and can be measured in Cubic Feet per Minute or Cubic Meters per Minute.

4 MPH Wind:

100 CFM
Airflow in 6.4 KPH Wind: 2.83 CMM

5.2 MPH Wind:

117 CFM
Airflow in 8.4 KPH Wind: 3.31 CMM

7.4 MPH Wind:

186 CFM
Airflow in 11.9 KPH Wind: 5.27 CMM

9.8 MPH Wind:

218 CFM
Airflow in 15.8 KPH Wind8: 6.17 CMM

11 MPH Wind:

248 CFM
Airflow in 17.7 KPH Wind8: 7.02 CMM

AC Motor Horsepower:

1/25 hp

Max Amps:

2.5 A

Motor Type:

Shaded Pole - Open Ventilation

Airflow With Fan:

250 CFM
7.1 CMM

Fan Blade Count:

5 Blades

Fan Blade Diameter:

6 in.
15.24 cm.

Installation Guides Under Development. Coming Soon.


The Aura Fan EXHAUSTS CONTINUOUSLY whether the electric motor is ON or OFF. When the fan is off, outside air moving against the Aura Ventilator causes the Venturi effect, thereby creating an exhaust. The exhaust is created without the use of electricity or moving parts. On the days when the fan is not needed, the Aura Vent will still operate passively; this increases the life of the motor since it is not in constant use. The Aura Fan Ventilator reduces energy consumption.