• Kit #1 product graphic for DRY-CON X® ventilation system, featuring a high-gloss black plastic exhaust vent and a wall-mount intake vent designed for 20 ft shipping containers
  • Video demonstration of the DRY-CON X® shipping container vent installation process, showing Step 4: Mounting the exhaust vent to the exterior wall of a white storage container.
  • Official 25-year manufacturer's warranty badge for DRY-CON X® container vents, highlighting key features: UV protection for temperatures from -40°F to 200°F, industrial-strength adhesive application, and 25 years of coverage
  • Dry-Con X® Shipping Container Exhaust Vent in high-gloss black plastic, featuring built-in protective screens and downward-facing weather baffles for passive ventilation.
  • 3D technical diagram of a shipping container illustrating the Dry-Con X® passive ventilation system, showing intake vents on the rear wall and a patented exhaust vent pulling air through the unit to prevent condensation.
  • "Wind tunnel laboratory test video comparing different types of shipping container vents, featuring the DRY-CON X® passive ventilation system demonstrating superior airflow on a conex box."
  • Dry-Con X container ventilation airflow diagram showing fresh air intake and stale air exhaust
  • Technical diagram of a white shipping container highlighting Rear-Wall and Side-Wall vent placement, with a callout explaining how adapter plates fill recessed corrugated sections for a flat, weather-tight seal.
  • Placement guidance for container interior ventilation with arrows indicating airflow direction.
  • Technical diagram for shipping container fume extraction showing a high-mount air intake and a floor-level exhaust vent. Blue arrows illustrate cross-flow ventilation designed to pull out heavy gases and fumes that settle at the bottom of the unit.
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Valley Outdoor Supply

DRY-CON X® Container Vent Kit | Condensation and Moisture Control

$167.00 USD
$167.00 USD
Sale Sold out
Shipping calculated at checkout.
Ventilation Kits - 4 Options to choose from
Product description — version: 2026-01-20_v7.0 FINAL PRODUCTION (LOCKED)

DRY-CON X® Shipping Container Ventilation System | Condensation and Moisture Control

25-year manufacturer warranty (tap to jump to warranty).

What it is: a passive shipping container ventilation system that pairs a container exhaust vent with a matched intake vent to create continuous airflow for container moisture prevention and container mold prevention.

How it works: as air passes over the exhaust vent, a natural vacuum is created that pulls fresh ambient air in through the intake. This produces multiple daily air exchanges with no power and no moving parts, designed to help reduce condensation, mold, corrosion, and inside rain. Stocked locally by Valley Outdoor Supply in Lake Stevens, Washington.

Scroll or tap a section below
Quick Jump (tap one)
1
Kit Finder
Answer two questions to find Kit 1 through Kit 4
2
Kit selection
Kit 1 through Kit 4 and what is included
3
Vent placement guide
Moisture control and fume extraction
4
Condensation explained
Why it happens and what DRY-CON X does
5
Downloads
Manual, specs, cutouts, adapter details
6
FAQ
Questions and answers (metafields)

Quick summary

Passive shipping container ventilation — no electricity, no fan, and no moving parts

Reduces “container rain” and moisture buildup — helps fight condensation, rust and corrosion, and mold

Complete vent kits for 20 ft and 40 ft containers — choose rear-wall intake (door-end wall) or side-wall intake (long side wall) based on your site layout

Kits only (Kit 1 through Kit 4) — matched exhaust + intake systems; individual vents are not sold separately

Find the right kit (Kit 1 through Kit 4) Tap here for details using container location.
DRY-CON X® Kit Finder
Choose your container size and scenario to get a recommended kit link. If you are unsure, use the help button and we will guide you.
Important note
If you have obstructions within 3 feet of the side or back walls, contact us for customized placement guidance before you cut.
Email for help
Tip: This kit finder helps you choose between a rear-wall intake kit and a side-wall intake kit. Final vent placement should always be verified using the manufacturer documents before you mark and cut.

DRY-CON X® kit selection guide (20 ft and 40 ft shipping containers)

Rear-wall intake: The intake vent goes on the short wall by the container doors. Pick this if that end is open and you can easily reach it. This gives the most straightforward airflow path.

Side-wall intake: The intake vent goes on one of the long side walls. Pick this if the door-end wall is blocked (close to a building, fence, or other obstacle) or hard to get to. Side-wall kits include adapter plates so the vent can mount flat and seal tight on the ribbed side wall.

Tap here to view Kit 1 through Kit 4 descriptions

Kit 1 — 20 ft (rear-wall intake)

Includes
  • 1 exhaust vent
  • 1 rear-wall intake vent
Best for most DIY installs when the door-end wall is open and unobstructed.

Kit 2 — 40 ft (rear-wall intake)

Includes
  • 2 exhaust vents
  • 2 rear-wall intake vents
Standard choice for 40 ft containers with clear door-end access.

Kit 3 — 20 ft (side-wall intake)

Includes
  • 1 exhaust vent
  • 1 side-wall intake vent
  • 1 adapter plate
Choose when rear access is blocked or the layout restricts airflow from the door end.

Kit 4 — 40 ft (side-wall intake)

Includes
  • 2 exhaust vents
  • 2 side-wall intake vents
  • 2 adapter plates
Highest-capacity side-wall layout when door-end access is blocked or site constraints are tight.
Why intake location and adapter plates matter?

Rear-wall intake refers to installing the intake on the door-end of the container. This end has flat steel doors, so the vent mounts directly without adapter plates. Rear-wall intake is a common first-time layout when the door area is open and unobstructed.

Side-wall intake is used on the long sides of the container, which are fully corrugated. These ribs prevent the vent from sitting flat, so adapter plates are required to fill the recessed sections and create a proper sealing surface. Side-wall intake is chosen when the door-end wall is blocked or too close to obstacles.

Adapter plates are used on side-wall installations to bridge the container’s ribbed, corrugated wall profile. They fill the recessed sections so the intake vent can sit flat, mount correctly, and seal against weather as intended. This ensures proper installation and long-term performance.

Kits only
Valley Outdoor Supply sells DRY-CON X as complete kits (Kit 1 through Kit 4). We do not sell individual exhaust or intake components.
Call 360-916-8312 for quick kit guidance

Shipping container vent placement guide (moisture control and fume extraction)

Goal 1: Moisture control and condensation reduction
DRY-CON X moisture control vent placement diagram showing high exhaust vent and low intake vent
Higher exhaust helps remove warm, moist air. Keep a clear path from intake to exhaust for best airflow.
Goal 2: Fume extraction and vapor removal
Shipping container fume extraction vent placement diagram showing low exhaust vent and higher intake vent
Lower exhaust may be used for heavier vapors. Follow material-specific guidance and verify placement before cutting.
Blue arrow = Intake air
Orange arrow = Moisture airflow
Purple arrow = Fume and vapor airflow
Caution
Follow the manufacturer placement guide before cutting. Verify cutout sizes, adapter orientation, and sealing method in the official installation documents.
Manufacturer PDF: 8 Steps to a Dry Container (PDF)

Why shipping containers get condensation (and how DRY-CON X® reduces it)

Steel shipping containers can trap warm, humid air. When outside temperatures drop, interior steel surfaces can cool below the dew point and moisture can form on ceilings and walls. Over time, this can contribute to corrosion, mold growth, and damage to stored materials.

DRY-CON X is designed to promote continuous passive airflow. Venturi-based aerodynamics at the exhaust vent encourage stale, moisture-laden air to exit while fresh ambient air is drawn in through the intake. By increasing natural air exchange without mechanical assistance, DRY-CON X helps reduce moisture buildup and the conditions that lead to condensation.

Key design features

  • No power required — passive airflow with no moving parts
  • Wall-mounted ventilation — avoids roof penetrations and reduces leak risk compared to roof-mounted turbine vents
  • Durable construction — designed for long service life with minimal maintenance

Resource documents (manual, specs, cutouts, adapter details)

Download official product and installation documents: cutouts, adapter details, and placement guidance.

Tap here to see manufacturer warranty and support

Manufacturer warranty: DRY-CON X is backed by a 25-year manufacturer warranty. Warranty terms and exclusions apply and are administered by the manufacturer.

Typical warranty-related specs (per manufacturer technical data)

  • Construction: UV-protected polycarbonate
  • Temperature range: designed for extreme conditions from -40°F to 200°F
  • Adhesion: industrial-grade 3M VHB double-sided tape for a permanent, high-strength bond (no mechanical fasteners required)

Where to confirm warranty terms: see the manufacturer Product Guarantee and Warranty Information page.

Manufacturer warranty info

Need help: Email sales@valleyoutdoorsupply.com or call 360-916-8312.

Need help choosing a kit? Email sales@valleyoutdoorsupply.com or call 360-916-8312.

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FAQ

Why are there two completely different looking vents on a shipping container?
One vent is the exhaust (patented) and the other is the intake. The exhaust is the driving force that generates airflow and pulls stale air out. The intake lets fresh air enter to replace the air the exhaust is pulling out. The manufacturer designed both vents to work together for shipping container installation without DIY modifications to the vents themselves.

Why not use just any vent like a louvered design for the intake?
The manufacturer states louvered vents can allow wind blow-in from common angles, which can bring airborne material inside (ash, pollen, dust, snow, fumes). Their hooded and screened intake is designed to help keep weather and critters out while greatly reducing pollution entry. They also note universal louver fits can leave gaps on different container wall profiles and can be difficult to seal properly.

Why does the manufacturer discourage mounting the intake at floor level?
The manufacturer feels the air is cleaner higher off the ground. As an intake, it can draw in car or lawn mower fumes, and even sparks from nearby equipment. They also cite higher moisture near grass, puddles, snow, and debris buildup close to the ground.

Why are the vents made of polycarbonate plastic?
The manufacturer states the patented exhaust shape is extremely precise and must remain as designed or airflow performance is compromised. Polycarbonate resists dents and deformation better than metal and can recover its shape after impacts. They also note that in near-ocean environments, electrolysis is possible with an aluminum vent attached to a steel container.

How do you suggest venting a container with petroleum products inside?
The manufacturer describes two approaches depending on the goal. For fumes, place an exhaust low at one end with an intake high at the other end. If heat is also a concern, they describe using one exhaust low and another high near the ceiling at the same end. Placement depends on the stored material and site conditions, so verify guidance before cutting.

What causes shipping container condensation (inside rain)?
Warm air holds more moisture than cold air. As warm interior air rises and contacts a cold metal ceiling, condensation can form. Daily temperature swings can increase condensation risk. The manufacturer notes an insulated ceiling can help because it reduces the cold surface that drives condensation.

Is there a downside to using the double-sided tape for installation?
The manufacturer states the industrial-grade tape was selected for this application and tested across climates and conditions. They report no tape failures or sealing issues as of October 2024 when installed correctly. Follow the manufacturer installation steps for surface prep, positioning, and sealing.

Where do I confirm final placement before cutting?
Use the manufacturer placement guidance and installation manual for approved locations and orientation before cutting any openings.

Which documents should I download first?
Start with the Installation Manual, then review Cutouts and Adapter Details, then confirm placement guidance before you mark and cut.
View full details