The phrase "airtight envelope" is correct and usable in written English.
It can be used when referring to an envelope that is sealed in a way that prevents air or moisture from entering, often for the purpose of preserving contents.
Example: "To ensure the documents remain in pristine condition, please place them in an airtight envelope before shipping."
Alternatives: "sealed envelope" or "hermetically sealed envelope".
Recently, airtight envelope system has become popular in the design of office buildings to reduce heating and cooling loads.
Changing the underpressure value inside the airtight envelope allows variation of the mechanical properties of such a complex system, like stiffness or damping coefficients.
To reach a reliably airtight envelope, a new method was engineered for building the log walls: The inner wall was built first.
The airtight envelope is an important factor, as is the adaptive vapour barrier that is very tight at low relative air humidity and up to 100 times more open at a higher air humidity.
The chamber has a relatively airtight envelope, including a door with a refrigerator-style seal.
An airtight building envelope is crucial to achieve energy efficient buildings.
That is achieved through a system of interior and exterior air exchange, an airtight building envelope and energy-saving appliances, among other things.
The project shows that a log house is a truly sustainable building with a low carbon footprint, airtight building envelope and a safe building physics.
Well-insulated and airtight building envelope.
The study showed that the following design features are essential for achieving this low-energy office building in Sweden: Reasonable WWR Demand-controlled ventilation Demand-controlled lighting and low-power equipment Wider temperature set-points Well-insulated and airtight building envelope.
And now here I am, hands scrubbed, forming a little packet out of tin foil to put the two smoked salmon steaks in, blathering shit as I do it like I know what I'm talking about: "If you whack in some olive oil and a bit of rosemary from the garden, like this, and then fold it over, it forms an airtight metal envelope and the fish steams inside.
