We provide that this never results in the loss of an item
In my experience the food is pretty similar in both the BA business and first class lounges, at least at breakfast (I did not stay to see what the lunch offerings at the 5B club were like) and only really differentiated in the Concorde Room (Galleries First has upgraded wine and spirits, of course)
If demand is high, manufacturers and retailers may adjust prices accordingly
The 27x27x1 is a non-standard air filter size , which means you won't find it on the shelves at big-box hardware stores

Heres exactly how I evaluate air purifiers: Test Environment Primary Test Space: 728 cubic foot room (approximately 12 13 8 ceiling) Secondary Test Space: Sealed 4 cubic foot acrylic smoke box for controlled tests Ambient Conditions: 68-72F, 40-50% humidity, baseline ambient noise 28-30 dB Equipment Used TSI AeroTrak 9306 Particle Counter ($4,500 professional-grade unit, not a consumer sensor) Measures PM1, PM2.5, PM10 with laboratory accuracy Extech 407768 Sound Level Meter (Type 2, calibrated) Measures decibel levels to within 0.1 dB Kill-A-Watt P3 Power Meter Tracks energy consumption to 0.01W precision Smoke Source: Standardized incense sticks (for repeatability across tests) and actual cigarette smoke (for real-world validation) The 5 Core Tests I Perform Test 1: Smoke Box Speed Test I fill a sealed 4 cubic foot acrylic box with dense smoke until visibility is near zero (PM2.5 typically exceeds 1,000 g/m)