PRESSURE RELIEF PORTS

FOR COLD ROOMS & BLAST CHILLERS

Rated 4.9/5 by our customers

Explovent Relief Ports equalise pressure caused by temerature changes & door operation.

Balance pressure

Protect panels & seals

  • AUSTRALIAN MADE

    Built by Australians for Australian conditions.

  • DESIGNED FOR LOW TEMP ROOMS TO -20°

    Suitable for cold rooms ad blast chillers.

  • Protects Panel Seals

    Helps reduce pressure related stress and movement.

  • Available in 5 models

    100mm to 300mm low temperature options.

1 of 4
  • THE PROBLEM

    • Panel movement and stress
    • Failure of atmospheric seals
    • Reduced operating efficiency
    • Ice formation in low temperature rooms
    • Increased maintenance and repairs
  • THE SOLUTION

    • Balances pressure during temperature and door changes
    • Protects panels and atmospheric seals
    • Helps maintain efficiency
    • Reduces ice buildup
    • Supports reliable, consistent operation

Pressure Relief Port Sizing Guide

Selecting the correct pressure relief port size is important for maintaining effective pressure equalisation within cold rooms and blast chillers.

VIEW RANGE
  • Cut penetration to required diameter.

  • Insert external to internal and secure.

  • Ensure electrical tail is damage free.

  • Install cover plate and seal. Connection by licensed electrician required.

1 of 4

"Keeping it Equal"

As temperatures rise and fall, and as doors are opened and closed, pressure differences develop within refrigerated environments. If these pressure changes cannot equalise effectively, they can place stress on insulated panels, damage atmospheric seals, reduce operating efficiency and contribute to ice buildup.

Manufactured in Australia by JAV Industries, the Explovent Relief Port provides reliable pressure equalisation for commercial refrigeration applications across Australia.

Frequently Asked Questions

What is your return policy?

We offer a 30-day return policy on all items. Items must be in original condition with all packaging and documentation.

How long does shipping take?

Standard shipping typically takes 2-4 business days.

How can I contact customer support?

You can reach our customer support team via email at javreliefports@gmail.com or through the contact form on our website. We typically respond within 24 hours.

What is a cold room pressure relief port?

A cold room pressure relief port is a device designed to equalise pressure differences between the inside and outside of a refrigerated room. As temperatures change or doors are opened and closed, pressure can rapidly increase or decrease. A pressure relief port allows controlled airflow in both directions to neutralise these pressure differences, helping protect insulated panels, door seals and refrigeration system performance.

How many pressure relief ports do I need for my cold room?

The number of pressure relief ports required depends on the room type and internal volume.

Low Temperature Room:
1 Relief Port per 40m³ of internal room volume

Blast Chiller Room:
1 Relief Port per 20m³ of internal room volume

For larger rooms, additional relief ports should be installed based on the total internal room volume.

Why do cold rooms need pressure relief ports?

Cold rooms need pressure relief ports because temperature changes create pressure differentials that can place significant stress on insulated panels, doors and seals. Without adequate pressure equalisation, rooms can experience vacuum conditions, over-pressure, seal failures, ice buildup and reduced energy efficiency. A properly sized pressure relief port helps maintain structural integrity and consistent room operation.

What causes negative pressure in a cold room?

Negative pressure occurs when air inside the room cools and contracts faster than replacement air can enter. This commonly happens after door openings or during rapid temperature pull-down cycles. The resulting vacuum can make doors difficult to open and place stress on wall panels and seals. Pressure relief ports are specifically designed to neutralise these pressure changes.

How does a cold room pressure relief port work?

A cold room pressure relief port works by allowing controlled airflow whenever a pressure difference develops between the inside and outside of a refrigerated room. Most designs use lightweight multi-flap mechanisms that open in either direction. This bi-directional airflow helps neutralise both vacuum conditions and over-pressure situations while maintaining the integrity of the cold room.

Can pressure damage cold room panels?

Yes. Significant pressure differentials can place considerable stress on insulated cold room panels. Over time, this stress can contribute to panel movement, bowing, seal failure and, in extreme cases, structural damage. Pressure relief ports help minimise these loads by maintaining pressure equalisation throughout normal refrigeration operation.

How many pressure relief ports does a cold room need?

The number of pressure relief ports required depends on room volume and application. As a general guide, JAV Industries recommends approximately one relief port per 403 cubic metres of internal room volume for low temperature rooms. Larger rooms or specialised applications may require multiple units depending on operating conditions and system design.

What is the difference between the JAV standard and L models?

JAV standard models are designed for applications operating above -20°C, while JAV L models are designed for applications operating above -45°C and are recommended for blast chillers. Available sizes include 100mm, 150mm, 200mm and 250mm diameters. All models operate on 220V power and are designed specifically for refrigeration pressure equalisation.

Australian Made For Australian Conditions

JAV Industries manufactures pressure relief ports specifically for the Australian refrigeration industry.

By manufacturing locally, we maintain control over quality, specifications and product consistency while providing reliable supply throughout Australia.