How Much HyperVent Do I Need? A Complete Size & Ordering Guide
One of the most common questions we receive is, "How much HyperVent do I need?"
The answer depends on the size of your mattress or sleeping platform. Because HyperVent is sold by the foot from a 39-inch (99 cm) wide roll, you only need to order the length required for your project.
Whether you're preventing condensation beneath a boat mattress, RV bed, camper van sleeping platform, cabin bunk, or even a household mattress, this guide will help you determine how much HyperVent you need.
HyperVent Length Guide for Standard Mattress Sizes
The chart below provides recommended lengths for common mattress sizes. If your mattress has a custom shape or size, simply measure it before ordering.
| Mattress Size | Mattress Dimensions | Recommended HyperVent Length |
|---|---|---|
| Personal | 27" × 74" | 7 Feet |
| Twin | 39" × 74" | 7 Feet |
| Twin XL | 39" × 80" | 7 Feet |
| Three Quarter | 48" × 74" | 9 Feet |
| Double / Full | 54" × 74" | 9 Feet |
| Double XL | 54" × 80" | 9 Feet |
| Queen | 60" × 80" | 10 Feet |
| King | 78" × 80" | 13 Feet |
Always measure your mattress or sleeping platform before ordering, as dimensions can vary between manufacturers.
Why Is HyperVent Sold by the Foot?
Unlike traditional mattress underlays, HyperVent is designed to fit almost any sleeping surface.
Selling HyperVent by the foot allows you to order only the amount you need, reducing waste while making it easy to create a custom fit for boats, RVs, camper vans, cabins, tiny homes, and standard household mattresses.
Each roll is 39 inches (99 cm) wide and can be easily trimmed using household scissors or a utility knife.
What If My Mattress Is Wider Than 39 Inches?
No problem.
If your mattress is wider than the roll, simply install two sections side by side and trim them to fit.
This method works especially well for:
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Double mattresses
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Queen mattresses
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King mattresses
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Marine V-berths
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RV mattresses
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Camper van sleeping platforms
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Custom bunks
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Cabin mattresses
Even when multiple sections are used, HyperVent continues to provide excellent airflow beneath your mattress.
Measuring Custom Mattresses
Not every mattress is perfectly rectangular. Boats, RVs, camper vans, and cabins often feature custom-shaped sleeping platforms that require a little extra measuring.
For the best fit:
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Measure the overall length of the mattress or bunk.
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Measure the widest point.
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Measure any tapered or angled sections.
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Trim HyperVent using scissors or a utility knife.
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Use trimmed offcuts to fill smaller areas if needed.
Because HyperVent is lightweight and flexible, it's easy to customize for virtually any sleeping platform.
Why Full Coverage Matters
HyperVent performs best when it covers as much of the mattress base as possible.
Creating a continuous air gap beneath the mattress allows warm, moist air to circulate and escape, helping reduce:
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Condensation
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Mold
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Mildew
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Musty odours
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Damp bedding
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Premature mattress wear
Taking a few extra minutes to measure correctly will help ensure maximum airflow and long-lasting protection.
Shop HyperVent at Harbour Chandler
Whether you're outfitting a boat, RV, camper van, cabin, or home, HyperVent provides a simple and effective solution for reducing condensation beneath your mattress.
Sold by the foot, HyperVent allows you to order exactly the amount you need for a custom installation. Browse our HyperVent Condensation Prevention Underlay and enjoy a drier, fresher, and more comfortable sleeping environment wherever your adventures take you.
