NOA Approved Impact Windows: What It Means & Why It Matters
What does NOA (Notice of Acceptance) mean for impact windows? Learn why this Miami-Dade certification is the gold standard for hurricane protection in Florida.
When shopping for impact windows in South Florida, you'll encounter the term "NOA Approved" constantly. Understanding what this means is essential to making an informed purchase.
What Is an NOA?
A Notice of Acceptance (NOA) is a certification issued by the Miami-Dade County Product Control Division confirming that a building product has passed rigorous independent testing for use in the High-Velocity Hurricane Zone (HVHZ).
The NOA is essentially a "report card" for the product — it lists exactly what was tested, what conditions it passed, and what installation methods are approved.
How Products Get NOA Approved
The testing process is exhaustive:
- Large Missile Impact Test: A 9-pound 2x4 lumber is fired at the window at 50 feet per second. The window can crack but must NOT allow penetration.
- Cyclic Pressure Test: The window is subjected to 9,000 cycles of alternating positive and negative pressure, simulating the sustained wind forces of a hurricane.
- Water Resistance Test: Under simulated driving rain conditions, zero water infiltration is allowed.
- Structural Test: The window is loaded to 150% of its rated design pressure without failure.
How to Verify an NOA
You can verify any product's NOA status on the Miami-Dade County Product Control Search:
- Visit the Miami-Dade County Product Control website
- Search by manufacturer name or NOA number
- Review the full test report and approved installation details
Every legitimate impact window dealer should be able to provide the NOA number for every product they install.
NOA vs Florida Product Approval (FL Number)
| Feature | NOA (Miami-Dade) | FL Number (State) |
|---|---|---|
| Testing Authority | Miami-Dade County | Florida Building Commission |
| Testing Standards | Most stringent (HVHZ) | FBC standard |
| Required In | HVHZ (Miami-Dade, parts of Broward) | Rest of Florida |
| Missile Test | 9 lb @ 50 fps (large missile) | 2 lb @ 50 fps (small missile) |
A product with an NOA automatically meets all FBC requirements, but NOT the other way around. Always ask for NOA-rated products — they provide the highest level of protection regardless of your location.
Red Flags to Watch For
- No NOA number provided: The dealer cannot prove their product is approved
- Expired NOA: NOAs must be renewed periodically
- NOA doesn't match the product: Some dealers install different products than what's on the NOA
- "Equivalent" claims: There's no such thing as "equivalent to NOA" — it either has one or it doesn't
At Izoah, every product we install has a current, verifiable NOA. Request your free quote and we'll provide full documentation for every window.