In order to accommodate a wide range of computer screen sizes and at the same time afford a reasonable amount of accuracy and convenience, the optimum scale for the graph has been selected where one screen pixel represents 2.5cm (approximately 1"). This is the '200%' grid scale setting, also the room designer form default opening setting.
Using the magnifying glass buttons scales of 50%, 100%, 200%, 400%, 800% and 1600% are obtained.
Where these scales are not sufficiently accurate then by right Mouse button clicking with the cursor focused upon the wall label the user may enter (or correct) precise wall length dimensions using keyboard numeric input accurate to 1mm.
Traditionally cold rooms are generally described at the planning stage using external dimensions. This tradition is believed to have come about because cold rooms are usually constructed inside another building shell or envelope. It is thus easier to associate the cold room with the space available to accommodate it. However, this practice does not apply in all countries and even where it does apply it is sometimes more convenient to work with internal dimensions. In either case Mistral's programs cope automatically with the sometimes very complex mathematics involved, particularly in schemes involving multiple and linked rooms of varying shapes and sizes. To switch program operation from external dimensions to internal dimensions, and vice-versa, a pair of simple 'toggle' buttons are provided in 'Coldwind Pro's' Program Launch Page Selection menu.
Clicking button changes the program from external dimension operation to interior operation and clicking the button switches it back again to operating with external dimensions.
For security or design integrity, if a program results file is created and subsequently re-opened, then whichever mode of operation the program was set to when the file was created and originally saved will be respected for that re-opened file. Regardless of the current setting.
Switching from external dimensions to internal in 'Coldwind Pro' will result in access to the Refrigerated Container (Lighter) load calculation routine being denied.