![Valuable feedback](https://3vcc27.n3cdn1.secureserver.net/wp-content/uploads/2013/07/1000520_532384523495912_683164513_n-470x140.jpg)
John Larsen from US wrote to Hallber-Rassy asking how well Air-Only ventilators work before he start drilling large diameter holes in his deck. Read below…
![Safehaven Marine undertake live (manned) self-righting roll over test](https://3vcc27.n3cdn1.secureserver.net/wp-content/uploads/2013/12/test1-470x140.jpg)
Safehaven Marine, specialist builders of pilot boats and rescue vessels have undertaken probably an industry first, by capsizing their latest Interceptor 48 Pilot / S.A.R….
![Templates for fitting](https://3vcc27.n3cdn1.secureserver.net/wp-content/uploads/2013/03/DSLP-template-extract.jpg?time=1722049731)
There are printable templates for fitting of Air-Only ventilator (DS), Air-Only Low Profile (DSLP), Air-Only Dorade (DSD Red and DSD Blue) below. DS template DSD…
![If the yacht rolls ... ?](https://3vcc27.n3cdn1.secureserver.net/wp-content/themes/oxygen/images/archive-thumbnail-placeholder.gif)
FAQ: If the yacht rolls (ie. while the boat is upside down), will the pvc balls still seal the inflow passages to stop water entry,…
![Does the vent have a shutter or seal ... ?](https://3vcc27.n3cdn1.secureserver.net/wp-content/themes/oxygen/images/archive-thumbnail-placeholder.gif)
FAQ: Does the vent have a shutter or seal allowing the user to close it from inside the boat to shut out both air and…
![What is the exact diameter ... ?](https://3vcc27.n3cdn1.secureserver.net/wp-content/themes/oxygen/images/archive-thumbnail-placeholder.gif)
FAQ: What is the exact diameter of the hole needed for this item? I am replacing an old Vetus ventilator & want to make sure…