From its founding roots as a roofing company over 40 years ago, O’Hagin has grown into an internationally-recognized designer and manufacturer of top-quality, state-of-the-art attic ventilation solutions. Today, O’Hagin has local and national testing approvals; is recognized for its industry-leading efforts in research, development and testing; and holds multiple domestic and international patents with many more patents pending.

1. © 2015 O’Hagin. All Rights Reserved.
O’HAGIN PROVIDES A COMPLETE ATTIC
VENTILATION ANALYSIS PROGRAM
– FREE!
Attic Ventilation Analysis provides a complete plan review for a
project’s attic ventilation system, consisting of code-required
calculations, attic vent quantities and a roof plan detailing the proper
placement of vents for adequate ventilation. It’s as easy as 1-2-3!
• Completed Project Checklist (shown on back)
• Architectural roof plan(s) for each elevation type including building cross sections,
preferably in AutoCAD (.dwg) file format, or
• Architecturally-dimensioned floor plan(s) for each elevation type, including
building cross sections
• Include any other relevant information specific to the project, such as fuel-burning
appliances in the attic space.
Architectural Services Department drawings@ohagin.com
210 Classic Court, Suite 100 Toll Free: (877) 324-0444
Rohnert Park, CA 94928 Fax: 707/588-9187
1. Requirements:
3. Submit:
•Authorization. At its discretion, O’Hagin is authorized to submit all plans and
materials to an outside consulting service provider or representative for review.
O’Hagin is not responsible for any loss or damage of any submitted materials.
•Responsibility: Final responsibility for compliance with all ordinances, regulations,
codes, etc., for any submitted project remains with the architects, builders and
contractors associated with that project. Recipients agree to hold harmless and
indemnify O’Hagin and its agents from any loss, cost or expense associated with
this free service.
•Reminder: Compliance with attic ventilation requirements should always be
verified at the local governing level.
2. Read:
Rev. 05/21/15

2. ~ REQUIRED INFORMATION ~
Date Submitted:
Contact:
Company:
Phone: Fax:
Email:
PROJECT NAME:
Location (City/State):
ADDITIONAL HELPFUL INFORMATION
If available, the following items would be very helpful to us in calculating a complete
attic ventilation analysis for your project. If not available, please send us whatever
information you may have.
1. Architectural roof plan(s) for each elevation type, including building cross
sections - preferably in AutoCAD (.dwg) file format, or
2. Architecturally-dimensioned floor plan(s) for each elevation type, including
building cross sections
3. Include any other relevant information specific to the project, such as fuel-
burning appliances in the attic space
CLIMTE
TYPE:  High Fire Area (WUI)  High Snow Area  High Wind Area (70-110 mph)
DESIRED VENTILATION
CALCULATION METHOD: O’Hagin Balanced System - Vents High & Low
O’Hagin Vents High with Alternate Method Low
Alternate Method High with O’Hagin Vents Low
BUILDING
TYPE:
No. of Plans/Project No. of Elevations / Plan
ROOFING
MATERIAL:
 Flat Tile  M Tile  S Tile  Composition Shingle,
Slate or Shake
ADDITONAL INFORMATION IF KNOWN:
Total Square Feet of
Attic Floor Space: Roof Pitch:
COMMENTS/SPECIAL INSTRUCTIONS:
©
2015 O’Hagin. All Rights Reserved. Rev. 05/21/15
ATTIC VENTILATION ANALYSIS
PROJECT CHECKLIST
O’HAGIN ARCHITECTURAL SERVICES DEPARTMENT
210 Classic Court, Ste. 100
Rohnert Park, CA 94928
Toll Free: 877/324-0444 ▲ Fax: 707/588-9187
Email: drawings@ohagin.com
~ Office Use Only ~
Date
Received
O’Hagin
Project #
Date
Completed
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Please check one or more options
for exhaust / intake method)