degrub

Just based on molecular weight of the gas molecule.

Make sure the propellant in the foam is non-ignitable as the gas will work its way into the electrical equipment.

A mouse can get through a hole with the area of a US nickel coin

I see two things online for rodents - peppermint oil spray ( maybe not good for cable insulation ?) and medium steel wool with PU or latex expanding foam pushed through it after steel wool pressed into hole. Supposedly mice hate to chew medium steel wool embedded in the foam.

Yeah, lagging only helps if many users are trying to access the server simultaneously. Pretty difficult to saturate a Gbit line. Usually, something else causes the issue - disk access, client device, buffer capacity in the nas, etc. for working on photos, direct attached storage with TB 3/4 or added nvme device internally would be best.

Purlin

Might look for a rat repellent spray with cat urine . other than a 5,000 v capacitor charge on the the duct……maybe a metalized epoxy or the mineral fiber based sealant used for firebox brickwork ? I have not heard of any PU foam product that is rat resistant.

Cruisers

You will find a lot of help here, both Asus , Qnap, and others www.snbforums.com

Tent

Clearwater (sloop)

Limbo

Charleston

Fox

Moonbow

Colours

Elevated

Cement

Porthole

Hurled

Tossed

Seizures

Impulse

Don’t forget about the recent kerfaffle in the US about implementing 5G cell towers near airports and radio altimeters on existing aircraft that were not properly shielded with the result of the altimeter indicating incorrect height above ground during landing approach. Some airport locations had 5G cell towers running on reduced power or not allowed and some affected aircraft providing commercial service to replace affected altimeters. Operation below 10,000 ft. above ground level is generally on radio altimeter while above is on barometric pressure. Airports that required Instrument flight rules to operate or to manage traffic capacity were among the most severely affected. This is still ongoing with completion expected next year before allowing increased transmit power. Most radio altimeters passed the testing, but there were many that did not. so it was/is a real risk to the aircraft. The previous restrictions were due to not being able to test every device with potential to transmit RF and all parts of the aircraft controls that might pick up the signal. So a blanket ban was put in place during the highest risk phases of flight - take off and landing, where the response time to diagnose and correct is the smallest. The other, very real issue for the cell companies was the rapid pace of switching between cell towers as the plane flew overhead. The equipment and network was not designed with this type of service in mind - client moving at 200 mph + versus driving at 80 mph on the road. In short, the cell network could get overloaded.

Resonances