Ventilation
Helsport airflow ii® ventilation system
In cooperation with the laboratories at NTH/sintef in Trondheim, Norway we have developed an advanced ventilation system for our tents, which:
• Remarkably reduces condensation in both inner and outer tents
• Provides an improved inner environment
• Increases sleeping comfort
Before we describe how the airflow ll® ventilation system works it is important to understand the issues of condensation, ventilation and air exchange inside all tents.
Sources of condensation
There are three main sources of condensation in tents: ambient air humidity, humidity from the ground below the tent and humidity from the occupants.
Condensation build-up greatly increases when high humidity and cold temperatures occur together. it collects on cold surfaces making the outer tent and ground sheet most vulnerable. when the tent is shaken by wind or rain, condensation can even fall into the tent giving the impression of a leak. Condensation will also easily occur between the ground sheet and your mattress as well as in the vestibule area, which doesn’t have a ground sheet (particularly when cooking or storing wet gear).
Ventilation
Ensures an even and steady flow of fresh air into the tent, which increases the level of security, improves the quality of sleep and removes condensation. Best results are achieved with a constant and controlled stream of air through the tent.
Air exchange:
My air exhange we mean a quick and complete change of air inside the tent in order to secure a quality atmospheric and thermal inner climate. It can be similar to opening the windows in your car while driving.
Atmospheric inner climate
High levels of co2 = “heavy air.” the human body needs approximately one litre/second of fresh air to avoid overexposure to co2. Clinical studies with NTH/sintef have proven that airflow ii® ventilation is capable of surpassing those levels of fresh air by a comfortable margin, thereby ensuring a pleasing climate for all occupants of the tent. Test results with tents without the airflow ii® concept show inadequate fresh air exchange and therefore for high levels of co2 gas.
Thermal inner climate
The airflow ii® ventilation system combats condensation by providing an air channel between the inner and outer tents that ventilates both the channel and the inside of the tent itself. Humidity caused by condensation drastically reduces the insulating properties of clothing and sleeping bags and creates a damp feeling inside the tent. by providing a steady stream of fresh air into the tent, airflow ii® will greatly improve your comfort level.
Helsport airflow ii® works by using the following Methods
A. Air intake at ground level under the outer tent. this air can then be vented into the inner tent through an adjustable valve.
B. Additional air intake at ground level through the inner tent. There is an adjustable valve on the inner tent.
C. Exhaust of air over on the opposite side of the inner tent through the inner tent’s upper mesh door valve. It is important that the mesh valve, which is on the opposite side of the air intake that the valve is used. In addition, the other door must be closed on tent models with two entries, as this valve will otherwise disturb the flow of air. The opening must be adjusted for the number of persons inside the tent.
D. Exhaust of air up and out of the outer tent. Here, the outer tent’s valve on the opposite side of the inner tent’s intake valve is used.
E. Air intake, which reduces condensation between the inner and outer tent.
The hanger system insures proper distance between inner and outer tents and proper airflow. Tents with two doors have the possibility for total of air exchange. The picture shows Helsport’s new 360 degree zipper opening now found on a number of our Pro and X-trem tents.
