The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Pacific HVAC Engineering Pty Ltd:
This app lists the fan products, related accessories and information on offer from Pacific HVAC Engineering Australia and New Zealand. Products are arranged in lists by category type with specific performance and technical information presented as detailed PDF files. Tapping through the categories into product lists and then individual product items fetches datasheet PDFs which can then be viewed or forwarded as needed. The app stores the PDFs locally on your device for offline retrieval. The app syncs with a web database to ensure that information presented is always the latest available.