# Vinayaka Engineering

> Clean Room Products & Services — Hyderabad


## Posts

- [Static vs dynamic pass box: which one does your clean room need?](https://vinayakaengineering.net/static-vs-dynamic-pass-box/): Both move material between rooms without moving people. The difference is what happens to the air inside the box — and that decides which one your transfer point needs.
- [EU 4, EU 7 and EU 14 filters explained](https://vinayakaengineering.net/eu4-eu7-eu14-filters-explained/): Clean air equipment uses three filter stages. Here is what each grade catches and why the order matters for filter life and air quality.
- [DQ, IQ, OQ and PQ: the four qualification documents explained](https://vinayakaengineering.net/dq-iq-oq-pq-explained/): Qualification proves that equipment was designed, installed and performs as intended. A plain-language guide to the four documents you receive.
- [Choosing clean room wall panels: PUF, rockwool or honeycomb?](https://vinayakaengineering.net/choosing-clean-room-wall-panels/): Panel thickness, skin material and infill decide how a clean room partition performs. A quick guide to the options and where each one fits.

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