HDB Fernvale Woods @ SengKang and Poison arrows from sharp corners of neighbouring blocks/stacks towards specific 5 bedroom types:- For example: some of the poison arrow(s) aimed towards the Five (5) bedroom types are:- 1. Block 457B stack 382 sharp corner aimed towards stack 416 2. Block 455B stack 48 aimed towards stack 352 3. Block 457A high floor e.g. 6th storey onwards of stack 356 is aimed towards stack 430. 4. 5/5 Storey carpark at Blk 457 has a sharp corner aimed towards stack 420.