Step 1) Measure outside dimensions of your vent
Step 2) Match to appropriate size on chart
| Outside Dimensions of Existing Vent | Purchase Airflow Breeze | | W 5.5" x L 11.5" | 4" x 10" Airflow Breeze | | W 5.5" x L 13.5" | 4" x 12" Airflow Breeze | | W 7.75" x L 11.75" | 6" x 10"/12" Airflow Breeze* | | W 7.75" x L 13.75" | 6" x 10"/12" Airflow Breeze* |
* Unit fits both size vent openings
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