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Why every van needs a powered fan
Breathing, cooking and drying clothes all release water vapour. In a small, cold metal box, it condenses on the coldest surfaces – usually behind panels where you can't see it. A powered fan with a cracked window on the opposite end is the most effective, lowest-energy fix.
MaxxFan vs Fan-Tastic Fan
| MaxxFan Deluxe 7500K | Fan-Tastic Fan (Dometic) | |
|---|---|---|
| Roof opening | 14 × 14 in | 14 × 14 in standard |
| Run in rain | Yes – integrated lid | Depends on model / add-on cover |
| Intake & exhaust | Yes | Model-dependent |
| Remote & thermostat | Included | Model-dependent |
| Profile | Taller | Lower |
Fan-Tastic Fan specifications vary by model; check Dometic's current range before buying.
MaxxFan Deluxe 7500K
Best for: Year-round ventilation, including while it rains or while you're away.
- Roof opening
- 14 × 14 in
- Speeds
- 10
- Airflow direction
- Intake and exhaust
- Rain protection
- Integrated lid – runs in rain
- Controls
- Remote + thermostat
- Taller profile on the roof than a bare vent
- Current draw not listed on the product page
Specs: manufacturer page, checked 2026-11-14. Based on manufacturer specs and public reviews – not a hands-on test.
Placement
Put the fan where moisture is produced and where it doesn't block the best solar area – often above the galley or bed. Plan it together with your solar panel layout.
Installation
Cutting a roof is irreversible. Mark from inside between ribs, prime bare metal edges against rust, use the manufacturer's recommended sealant, and keep the 12 V feed fused. If unsure, many van-conversion shops fit fans as a standalone job.
Frequently asked questions
MaxxFan or Fan-Tastic Fan?
The deciding feature for most van owners is rain: the MaxxFan Deluxe's integrated lid lets it run while it rains without a separate cover. Fan-Tastic (now Dometic) fans are typically lower-profile; some models need an add-on rain cover. Compare current models' features on the manufacturer pages.
What size hole do roof vent fans need?
The common RV standard is 14 × 14 inches, which the MaxxFan Deluxe uses. Check your roof ribs before cutting.
Should a van fan pull air in or push it out?
Exhaust mode with a window cracked on the opposite side creates a through-draught that removes moisture and heat. Reversible fans let you pull cool air in at night.
Spotted an outdated spec? Tell us.