# Roof Ventilator — Attic Ventilation Calculator

> Attic ventilation calculator for building code compliance and system design. (iPhone/iPad app by GRANARACO LLC.)

- Source: https://appshunter.io/ios/app/roof-ventilator/id1578108810 (this page in markdown: same URL + `.md`)
- Developer: [GRANARACO LLC](https://appshunter.io/developer/1578108812)
- Category: Productivity, Utilities
- Price: Free with in-app purchases
- Rating: 4.33/5 from 6 App Store ratings · 2 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.1 · 47 MB
- Languages: English
- Released: 2022-02-24
- Data updated: 2026-06-10
- Monetization: subscription
- User reviews in markdown: https://appshunter.io/ios/app/roof-ventilator/id1578108810/reviews.md

## What is Roof Ventilator?

Our application uses two inputs (one required): Attic Space Net Free Area and Intake Ventilation Net Free Area.  You will have to calculate those two inputs on your own.  Once the calculations are complete, enter the inputs into the application and find instant pertinent information calculated by our application that helps design your ventilation system to be within building code limits.
Roof attic vent calculator Provides:
-All code requirements per your attic space size based on the range of 1/300-1/150
-How many exhaust vents, or linear footage ridge vent need to be installed to be within code range and function; take a screenshot and print! We even used a white background as not to waste printer ink.
 -Lets you know if your current ventilation system is within code range
-The amount of needed changes you need to get within code range 
-Amounts (pieces or linear feet) of different types of products (rvo-38,AF-50, multiple ridge vents, birdholes, soffit vents, roof top intake strip vent) required to achieve balance of Intake Net Free Area and Exhaust Net Free Area, as well as notifications as to whether or not your system will function.
-Complete with a work backwards section that allows your roofers, or you, to enter the current amount of vents and notify you if it is within building code range and has enough Intake net free area.
- Has a modified ventilation system section, "New Total NFA," that tells you if your additional added Intake NFA fits within the building code range and subsequently provides you with the needed ventilation products and the amount required to provide a functional system.

A full subscription is required to access the calculator, all subscriptions come with a 7-day free trial. Please review the terms of use (EULA) at http://roofventilatorapp.com/terms-of-use and view our privacy policy here: https://roofventilatorapp.com/privacy-policy

## Key features

- Calculates code requirements based on attic size
- Determines exhaust vent and ridge vent quantities
- Checks if current ventilation is within code
- Suggests modifications for code compliance
- Recommends specific vent types and amounts
- Work backwards feature for existing systems
- Evaluates added intake ventilation NFA

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Monthly Subscription | $8.99 | per month |
| Roof Ventilator Annual | $34.99 | per year |


## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/roof-ventilator/id1578108810/reviews.md

### 5/5 — Saves me so much time! Why didn’t this exist before??

*2022-02-25*

I can’t believe this tool didn’t already exist, it seriously saved me 30 minutes per job review in just my first day having it. I would highly recommend every roofer get their hands on this app, seriously makes ventilation simple- ventilation has always been a struggle for me- never again!

### 5/5 — Wow!

*2022-02-25*

This makes my life so easy.  Definitely more than what I expected.

**Developer response:** That was the motivation, glad you like it!

## Frequently asked questions about Roof Ventilator

### What are the main inputs for the Roof Ventilator app?

The Roof Ventilator app requires two inputs: Attic Space Net Free Area and Intake Ventilation Net Free Area. You will need to calculate these values yourself before entering them into the application.

### What kind of ventilation information does Roof Ventilator provide?

Roof Ventilator provides all code requirements per attic space size, the number of exhaust vents or linear footage of ridge vent needed, and whether your current system is within code range. It also details needed changes and amounts of various product types for functional balance.

### Can Roof Ventilator help with existing ventilation systems?

Yes, Roof Ventilator includes a 'work backwards' section. This feature allows you to enter the current amount of vents and it will notify you if it's within building code range and has sufficient intake net free area.

### Does Roof Ventilator offer a free trial?

Yes, all subscriptions for Roof Ventilator come with a 7-day free trial. This allows you to explore the calculator's features before committing to a monthly or annual plan.

### What are the subscription options for Roof Ventilator?

Roof Ventilator offers a Monthly Subscription for $8.99 per month and an Annual Subscription for $34.99 per year. Both plans include a 7-day free trial.

### Is Roof Ventilator available on Android devices?

Based on the provided data, Roof Ventilator is currently supported on iPhone and iPod devices. Information regarding Android compatibility is not available.

### How often is Roof Ventilator updated?

The application was last updated on February 24, 2022, with version 1.0.0. Further update frequency details are not provided in the application data.

### What is the age rating for Roof Ventilator?

Roof Ventilator has an age rating of 4+. This indicates it is suitable for users aged 4 and above.

## Version history (last 2 releases)

### 2.0.0 — 2026-04-19

Subscription costs

### 1.0.0 — 2022-02-24

No release notes.

## Apps similar to Roof Ventilator

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Construction forms & templates](https://appshunter.io/ios/app/construction-forms-and-templates/id1600953899) | 5.0 (2) | Free | Productivity |
| [Standard Plumbing VMI](https://appshunter.io/ios/app/standard-plumbing-vmi/id6499554079) | — | Free | Productivity |
| [Contractor Boost AI](https://appshunter.io/ios/app/contractor-boost-ai/id1609476971) | 4.0 (4) | Free | Productivity |
| [The Claim Partner](https://appshunter.io/ios/app/the-claim-partner/id6450421177) | 5.0 (1) | Free | Productivity |
| [RemoteMeasure](https://appshunter.io/ios/app/remotemeasure/id6470903428) | 3.0 (4) | Free | Productivity |
| [LeadFetch](https://appshunter.io/ios/app/leadfetch/id6448290149) | — | Free | Productivity |

## Related topics

[roofing ventilation calculator](https://appshunter.io/ios/topics/roofing-ventilation-calculator)

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*